It is improbable that Brian is a rhino. It is likely that Sandra left the football. It is impossible that John went to the bedroom.
It is improbable that either Brian is a rhino, or John went to the bedroom.
It is improbable that either Brian is a rhino, or John went to the bedroom.
It is highly likely that either Brian is a rhino, or John went to the bedroom.
Either Brian is a rhino, or John went to the bedroom.