Discussion
A static variable with a non-zero initialiser costs
Answer: B
Correct answer: space in both flash and RAM
The variable lives in RAM so that it can be written, and its initial value must survive power-off, so a copy is held in flash and the startup code copies it across before main runs. A zero-initialised variable needs no flash copy, since the startup code simply clears that region - which is why zero initialisation is cheaper.
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