Refer to the exhibit. A network administrator tries to test the connectivity between routers R1 and R2, but the attempt to ping is unsuccessful. Based on the show ip interface brief command outputs, what could be the possible cause of the problem?

Interface S0/0/0 on router R1 is shut down.
Interface S0/0/0 on router R1 is configured with an incorrect IP address.
Interface S0/0/0 on router R2 is administratively down.Interface S0/0/0 on router R2 does not have the clock rate settings configured.