What will happen if one of the operators is unavailable to provide approval?

A campaign has been setup with an operator group (with 2 operators) as approvers in the "Approvals" section of the delivery.

What will happen if one of the operators is unavailable to provide approval?
A . The input of just the first approver is required in order for the process to continue onto the next activity
B. The campaign process will not proceed if both the first and seconds approvers do not provide inputs before expiry
C. The process will continue without approval if one has been provided before expiry
D. The process waits indefinitely for inputs from both approvers before moving to the next activity

Answer: C