Discussion
Elasticity differs from scalability in that elasticity emphasises
Answer: D
Correct answer: scaling in as well as out automatically
Scalability is the capacity to grow to meet demand and says nothing about coming back down. Elasticity adds the automatic return: resources are released when the load falls, which is what makes the metered charge track the actual demand. Without the scaling in, an autoscaled system would ratchet upward to its peak and stay there, and the cost benefit would disappear.
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