Q. Which among the following memory needs a periodic refresh?

A
ROM
B
DRAM
C
SRAM
D
All of the above
Solution:

Dynamic random-access memory (DRAM) is a type of random access semiconductor memory that stores each bit of data in a separate tiny capacitor within an integrated circuit. The capacitor can either be charged or discharged; these two states are taken to represent the two values of a bit, conventionally called 0 and 1.

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