You are a desktop support technician for your company. You plan to upgrade a computer that runs Microsoft Windows XP Professional to Windows Vista Business. The computer has teh following hardware configuration:
1 GHz CPU
768 MB of memory
20 GB Hard Drive with 5 GB of free space
Onboard Super VGA (SVGA) display adapter sharing memory

You need to ensure that the computer meets Windows Vista installation requirements.

A.
Add 256 MB of memory.

B.
Change the existing CPU to a 2 GHz CPU.

C.
Clean the hard drive to create at least 15 GB of free space.

D.
Add an additional display adapter with independent memory.