Discussion
Assertion (A): Function as a service is most economical for spiky or infrequent workloads.
Reason (R): Billing is by execution time, so an idle function costs nothing at all.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the economics. A function costs nothing while idle, so a workload that runs for minutes a day pays for minutes rather than for a machine standing by. The comparison reverses for sustained load: a function running continuously costs considerably more than a reserved instance of the same capacity, which is why the model suits spikes and not steady traffic.
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