Which approach should you recommend?

You are designing a SharePoint 2010 application. The code makes numerous calls to SPSite and SPWeb
objects.
The system and application performance is poor in the test environment. There is also a high level of memory use for IIS worker processes.
You need to ensure that the application performance and high memory use issues are addressed.
Which approach should you recommend?

A.
Use the Resource Throttling settings in Central Administration to increase site resource thresholds.

B.
Use the SPSite and SPWeb SharePoint 2010 Power Shell cmdlets.

C.
Ensure that the Dispose method of SPSite and SPWeb is called throughout the code.

D.
Ensure that the Close method of SPSite and SPWeb is called throughout the code.