Which approach should you recommend?

You are designing a SharePoint 2010 solution to manage statements of work. You need to design the solution
according to the following requirements:
Store the customer ID, purchase order number, estimated completion date, and other fields associated with
specific documents as they are uploaded.
.The information must be created so that it can be set within the Microsoft Word document information panel.
.Programmatically execute a series of tasks, including assigning tasks to validate the information and creating
team sites, based on information related to each document.
.These tasks must run to completion, even if the server is rebooted.
Which approach should you recommend?

A.
Create a document library for a custom content type that contains site columns for the document information.
Develop a SharePoint workflow for the document library to execute the document tasks.

B.
Create a document library for a custom content type that contains site columns for the document information.
Develop an event receiver for the document library to execute the document tasks.

C.
Create a custom list with fields to store the additional items and an attached document.
Develop a SharePoint workflow for the custom list to execute the additional tasks.

D.
Create a custom list with fields to store the additional items and an attached document.
Develop an event receiver for the custom list to execute the additional tasks.