Which of the following concepts allows an organization to group large numbers of servers together in order to
deliver a common service?

A.
Clustering

B.
RAID

C.
Backup Redundancy

D.
Cold site

Explanation:
Anytime you connect multiple computers to work/act together as a single server, it is known as clustering.
Clustered systems utilize parallel processing (improving performance and availability) and add redundancy (but
also add costs).
Clustering is done whenever you connect multiple computers to work and act together as a single server. It is
meant to utilize parallel processing and can also add to redundancy.