Disadvantage of dynamic RAM over static RAM is
DRAM has more idle power consumption which SRAM which has more operational power consumption SRAMs are way faster than DRAMs due to which they are used for cache memory DRAMs require periodic resfreshes DRAM has higher bit density than SRAM So the correct answer will be B
Option C
Because DRAM consists of Capacitors. So, there is a need to refresh capacitor charge every once in two milliseconds.
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