A technician has upgraded the memory of a laptop from 256MB to 512MB but Windows reports
that only 480MB of memory is available. Which of the following may be the cause?

A.
The laptop is using the missing system memory to shadow the BIOS.

B.
The laptop may not support double sided, high density memory.

C.
The laptop may not support DDR SODIMMs.

D.
The laptop is using the missing system memory as shared video memory.