An e-commerce site automatically adds capacity during a flash sale and releases it afterward, paying only for what it used. Which cloud characteristic does this demonstrate?
A.Fault tolerance
Fault tolerance is surviving component failure.
B.Elasticity
Correct. Grow-with-demand and shrink-after = elasticity.
C.High availability
HA is about minimizing downtime, not demand-matching capacity.
D.Agility
Agility is speed of provisioning, a related but distinct benefit.
Why this answer
Elasticity is matching supply to demand dynamically — scaling out for peaks and back in after. Scalability is the capability to grow; elasticity is the automatic, demand-driven adjustment — the exam tests this distinction.
Correct answer: B · Last reviewed 2026-10-28
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