which two options will achieve the goal?

You are managing a SharePoint farm in an Active Directory Domain Services (AD DS) forest and
SharePoint Online.
You resolve an authentication issue with the on-premises SharePoint farm. Users now experience
performance degradation.
You need to configure SharePoint 2013 Usage and Logging service to the default settings for user
authentication logging.
From the Monitoring page in Central Administration, which two options will achieve the goal? Each
correct answer presents a complete solution.

A.
Setting the value of the Least critical event to report to the event log setting to Monitorable

B.
Setting the value of the Least critical event to report to the trace log setting to Monitorable

C.
Setting the value of the Least critical event to report to the event log setting to Information

D.
Setting the value of the Least critical event to report to the event log setting to Verbose

E.
Setting the value of the Least critical event to report to the trace log setting to Verbose

F.
Setting the value of the Least critical event to report to the trace log setting to Medium

Explanation:
B: Trace log, level Monitorable. This level records messages about all unrecoverable events that limit
the functionality of the solution but do not stop the application. When set to this level, the log also
includes events that the Unexpected setting records.
C: Event log, Information: Information messages do not require any action. However, they can
provide valuable data for monitoring the state of your solution.
Incorrect answers:
Not A: There is no Event log setting Monitorable.
Not D: Event log, Verbose: This event log level corresponds to lengthy events or messages.
Not E: Trace log. When set to the Verbose level, the log includes most actions. Verbose tracing
produces many log messages. This level is typically used only for debugging in a development
environment. When set to log at this level, the log will also include all events that the Medium
setting records.
Not F: Trace log, level Medium: When set to this level, the trace log includes all messages except
Verbose and VerboseEx messages. This level records all high-level information about operations that
were performed. This level provides enough detail to construct the data flow and sequence of
operations. Administrators or support professionals could use this level of logging to troubleshoot
issues. When set to this level, the log will also include all events that the High setting records.
Configure diagnostic logging in SharePoint 2013
https://technet.microsoft.com/en-us/library/ee748656.aspx