Delayed members are a ________ or a running “historical” snapshot

delayed-members-are-a-or-a-running-historical-snapshot

Delayed members are a ________ or a running “historical” snapshot of the data set.

A. “rolling backup”

B. “roll backup”

C. “rolling commit”

D. none of the mentioned

This question was addressed to me in exam.

My question comes from Master Slave Replication in portion Replication Concepts, Processes and Replication Set of MongoDB

Right choice is A. “rolling backup”

Best explanation: They may help you recover from various kinds of human error.