What Is the Major Difference Between SRAM and DRAM

Multiple Choice

What is the major difference between SRAM and DRAM?

A) DRAMs must be periodically refreshed.
B) The only difference is the terminal from which the data is removed: from the FET Drain or Source.
C) SRAMs can hold data via a static charge, even with power off.
D) Dynamic RAMs are always active; Static RAMs must rest between data read/write cycles.