What is a server cluster?

A.
A tape array backup implementation

B.
A group of WORM optical jukeboxes

C.
A primary server that mirrors its data to a secondary server

D.
A group of independent servers that are managed as a single system

Explanation:
The correct answer is “A group of independent servers that are managed as a single system”. A
server cluster is a group of servers that appears to be a single server to the user.
Answer “A primary server that mirrors its data to a secondary server” refers to redundant servers.