Refer to the exhibit. Router E learned about the PIM RP （designated as 7.7.7.7） from four different sources. Routers A and D advertised the 7.0.0.0 network via EIGRP. Routers B and C advertised the 7.0.0.0 network via OSPF. Considering that all four Ethernet interfaces on router E could potentially lead back to the PIM-RP， when router E receives the first multicast packet down the shared tree， which incoming interface will be used to successfully pass the RPF check？（）

A.512 bits
B.768 bits
C.1024 bits
D.2048 bits

A. Configure RTA as an ASBR
B. Redistribute connected routes on RTA into OSPF
C. Set up a virtual link between area 1 and area 0
D. Set up a virtual link between area 1 and area 2
E. Add a static route into RTB and enter it into OSPF
F. Place a network 1.1.1.0 0.0.0.0 command into RTB
G. Set up a unique router ID on RTA using an RFC 1918 address
H. Change area 0 on RTB to area 1

A.disable Zone-Based Firewall as the two features are not compatible
B.disable Cisco Express Forwarding as the two features are not compatible
C.generate a certificate and export on Cisco.com to receive a signature update
D.import the public RSA key from the Cisco IPS team that allows the router to verify that a signatureupdate （which was signed by this key） comes from Cisco