premise: How to address an archbishop<br>Greet an archbishop formally by saying " your excellency. " when you approach an archbishop, it's best to give them a formal salutation. Both " your excellency " and " your grace " are acceptable and highly respectful greetings.
hypothesis: " Your excellency " and " your grace " are suitable greetings for a bishop, too.
reason: The text only mentions greetings for an archbishop, so it's unclear if they apply to a bishop.