Discussion
Clock gating saves power by
Answer: D
Correct answer: stopping the clock to a block that is not in use
Dynamic power is consumed only when nodes switch, and nodes switch only when clocked, so gating the clock to an idle block removes its dynamic power entirely while leaving its state intact. What it does not remove is leakage - the block is still powered. Removing the supply is power gating, which saves the leakage too but loses the state.
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