Which statement can a network designer use to describe route summarization to an IT manager?

Which statement can a network designer use to describe route summarization to an IT manager?

A.
It is the grouping of multiple contiguous subnets into one Class A, B, or C IP address to minimize routing table size.

B.
It is the grouping of multiple discontiguous subnets to increase routing performance.

C.
It is the grouping of multiple contiguous networks and advertising as one large network.

D.
It is the grouping of ISP network addresses to minimize the number of routes to the Internet.