Which of the following requires the network administrator to schedule a maintenance window?

A.
When a company-wide email notification must be sent.

B.
A minor release upgrade of a production router.

C.
When the network administrator’s laptop must be rebooted.

D.
A major release upgrade of a core switch in a test lab.

Explanation:
During an update of a production router the router would not be able to route packages and the network traffic
would be affected. It would be necessary to announce a maintenance window.
In information technology and systems management, a maintenance window is a period of time designated in
advance by the technical staff, during which preventive maintenance that could cause disruption of service may
be performed.