please I want to know if it is safe to issue "ip mroute 0.0.0.0 0.0.0.0 X.X.X.X pointing to the interface the multicast packet were received in the CCIE lab, whether or not there is RPF failure.
Read your requirements and always check with the proctor first. Static mroutes are really meant to override unicast information. There may be scenarios that exist that enable multicast routing on interfaces the IGP does not choose as the route. In these scenarios, state your case clearly to the proctor and you should have no issue.