which of the following is a potential routing problem?

Refer to the exhibit.

Based on the output of the R1# show ip route command and the information presented in the graphic, which of the following is a potential routing problem?

Exhibit:

A.
the use of summarization for discontiguous networks

B.
the use of CIDR with a routing protocol that does not support it

C.
the use of VLSM with a routing protocol that does not support it

D.
the use of the no auto-summary command with a protocol that does not support summarization

E.
the use of the ip route 0.0.0.0 0.0.0.0 command with a routing protocol that does not support it