XYZ inc. is an e$-$commerce company where web traffic spikes multiple times throughout the year $($i$.$e$.,$ Black Friday, Fathers Day, Single Day$),$ CIO has requested you to suggest him$/$her a cost$-$effective architecture to handle the sporadic traffic spikes. Which of the following characteristics BEST describes what the CIO has requested?

a$.$

Redundancy

b$.$

Elasticity

c$.$

Scalability

d$.$

High availability