Refer to the exhibit. Router RA is not able to ping the loopback Lo0 on router RB. What could the
problem be?
A.
Router RA is using plain text authentication while Router RB is using encrypted authentication.
B.
Router RA is using RIP version 1 while Router RB is using RIP version 2.
C.
The key strings do not match.
D.
The loopback addresses have different subnet masks.
E.
MD5 authentication is not possible with RIP.
F.
The key chains do not match.