A security engineer on a large enterprise network needs to schedule maintenance within a fixed window of time.
A total outage period of four hours is permitted for servers. Workstations can undergo maintenance from 8:00
pm to 6:00 am daily. Which of the following can specify parameters for the maintenance work? (Select TWO).

A.
Managed security service

B.
Memorandum of understanding

C.
Quality of service

D.
Network service provider

E.
Operating level agreement