Based on the show ip route isis output on R1, which statement is true?

Based on the show ip route isis output on R1, which statement is true?

A.
The i su 10.1.0.0/23 route is an IS-IS external route.

B.
The R1 IS-IS router is an ASBR.

C.
The i su 10.1.0.0/23 route is a suppressed route.

D.
The i su 10.1.0.0/23 route is a summary route.

E.
The R1 IS-IS router is an ABR that belongs to multiple IS-IS areas.

F.
The R1 IS-IS router is performing route aggregation and is suppressing the more specific 10.1.0.0/23 prefix.