2012 Feb 23 23:00:08.676710 pim: [16132] (default-base) Received unauthenticated hellomessage from 10.1.1.2 on Ethernet1/18, message discarded

2012 Feb 23 23:00:12.528763 pim: [16132] (default-base) Send Hello with AH on Ethernet1/18
from 10.1.1.1, holdtimE. 105 secs, dr-priority: 1
You are troubleshooting a PIM neighbor adjacency that is not coming up. You issued the
command show ip pim neighbor e1/18 and confirmed there is no PIM neighbor on the interface.
What is the problem based on the debug output?

A.
The peer router 10.1.1.2 has PIM disabled on its interface connecting to Ethernet1/18.

B.
The peer router 10.1.1.2 has the wrong PIM password configured on its interface connecting to
Ethernet1/18.

C.
The local router 10.1.1.1 has the wrong PIM password configured on Ethernet1/18.

D.
The peer router 10.1.1.2 does not have PIM hello authentication enabled on its interface
connecting to Ethernet1/18.

E.
The local router 10.1.1.1 does not have PIM hello authentication enabled for Ethernet1/18.

Explanation: