Based on the show ip route isis output on R1, which statement is true? ()<br /> <img src="https://nimg.ppkao.com/2018-07/yiyu/2018073017310541773.jpg?sign=7403ea7bce3aad621800f56be696a446&t=62d52efd" />
A、The i su 10.1.0.0/23 route is a suppressed route.
B、The i su 10.1. 0.0/23 route is a summary route.
C、The i su 10.1.0.0/23 route is an IS - IS external route.
D、The R1 IS - IS router is an ASBR.
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.