What are two methods of ensuring that the multicast RPF check passes without changing the unicast routing table? (Choose two.)
A. disabling the interface of the router back to the multicast source
B. disabling BGP routing protocol
C. implementing MBGP
D. implementing OSPF routing protocol
E. implementing static mroutes
Correct answer should be C & E, if you disable interface nothing will work.
the correct answers are C&E
looks to me that these cisco exams are not reasonable or for knowledge testing but rather just part of the business.
Are you sure A is correct?
https://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/16450-mcastguide0.html#anc5
A is not correct. Because if shutdown the Interface means that you are changing the unicast routing table