What should you modify?

Your network contains a server that has Microsoft SharePoint Foundation 2010 installed.

Users report that it takes as many as five minutes to receive an email notification when content on the SharePoint site is changed.

You need to reduce the amount of time it take for users to receive the email notifications.

What should you modify?

A.
the incoming email settings

B.
the outgoing email settings

C.
the Task Scheduler Library

D.
the timer job definitions

Explanation:
Timer job reference (SharePoint Foundation 2010)

This article describes the default timer jobs for SharePoint Foundation 2010. A timer job runs in a specific Windows service for SharePoint Foundation. Timer jobs also perform infrastructure tasks for the Timer service, such as clearing the timer job history and recycling the Timer service; and tasks for Web applications, such as sending e-mail alerts. A timer job contains a definition of the service to run and specifies how frequently the service is started. The SharePoint 2010 Timer service (SPTimerv4) runs timer jobs. Many features in SharePoint Foundation rely on timer jobs to run services according to a schedule.

Manage timer jobs
You can check the status of a timer job and edit the timer job definition.
For the general administration of all jobs, the SharePoint Central Administration Web site has a Timer Job Status page and a Job Definitions page. You can find these pages in Central Administration, on the Monitoring page, in the Timer Jobs section.
From the View menu, you can filter the timer jobs at the following levels:
* All Displays all timer jobs for the farm.
* Service Displays all the timer jobs for a particular service. If you select this command, use the Service menu to select the service by which you want to filter the listed jobs.
* Web Application Displays all the timer jobs for a Web application. If you select this option, use the Web Application menu to select the Web application by which you want to filter the listed jobs.
* Server Displays all the timer jobs for the specified server. If you select this command, use the Server menu to select the server by which you want to filter the listed jobs.
* Job Definition Displays all the timer jobs for the specified job definition. On the Timer Job Status page, use the Job Definition menu to select the job definition by which you want to filter the listed jobs.
* Failed Jobs Displays all the timer jobs on the farm that have failed to finish.

The SharePoint 2010 Timer service (SPTimerv4) is based on the Gregorian calendar for scheduling. For every job that you schedule, you specify when the timer job will run, specified in a 24-hour time format. You must specify the time in local time instead of as an offset from Coordinated Universal Time (UTC). The time is stored in that format. Daily, weekly, and monthly schedules also include a window of execution. The timer service will select a random time within this interval to start executing the job on each applicable server. This feature is appropriate for high-load jobs that run on multiple servers on the farm. Running this kind of job on all the servers at the same time might place an unreasonable load on the farm. Timer job schedules can be specified by using Windows PowerShell.

Default timer jobs
The following table lists the default timer jobs for SharePoint Foundation 2010.

Immediate Alerts
* Sends out immediate and scheduled alerts.
* 5 Minutes

Source: http://technet.microsoft.com/en-us/library/ff808317.aspx