A measure of the reserve capacity a process has to handle in unexpected increases in demand is the

Answer: Capacity cushion

Explanation:

Capacity cushion is termed as the reserve capacity of any organization which is kept for sudden demand increment or unexpected production capacity issues and loss. This element acts as the spare capacity for any business unit.

It is considered to have atleast one reserve capacity so that any unexpected demand of consumer can be met or any production capacity damage, web hosting issue etc can be handled. It makes the capacity available at the required time.