Select the one UNTRUE statement in regard to system memory.

A$.$RAM is random access memory and is non$-$volatile storage.

B$.$System memory is much faster than accessing data in a mass storage system, such as a hard disk.

C$.$If there isn't enough room in RAM, the memory space can be extended by using virtual memory.

D$.$Memory is the main storage space for programs and data when the computer is running.