If you are going to be running big software applications that involve a lot of graphics and functions, which of the following computers would be the best for you?

A computer with fast speed memory and 64MB of RAM
A computer with SGRAM video memory and 124 MB of RAM
A computer with a DDR main memory, SGRAM video memory, and 512 MB of RAM
A computer with SGRAM video and 64 MB of RAM

i Have no idea the answer i have studied and studied and studied but this was not on there !
Please help if you know this .