Which of the following would be the cause if a system utilizing a shared memory bus system that had its memory upgraded continues to have performance issues when using a graphic-intensive application?

A.
The CPU acceleration needs to be configured to the maximum setting.

B.
The screen refresh rate needs to be set to the minimum possible settings.

C.
The shared system can only utilize a fixed amount of memory from system bus.

D.
The Enable Write combining option needs to be selected in the Troubleshooting tab of the Advanced setting in the Control Panel Display applet.