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Mr. Belvedere, the head butler, is drafting a strict etiquette manual for the new estate staff. Select ALL the sentences that are grammatically correct and maintain his highly formal tone by placing the preposition before the relative pronoun.
The correct answers are The crystal glasses in which the vintage wine is served must be polished twice. and The dignitaries to whom you will serve afternoon tea are seated in the parlor.
Just like Mr. Belvedere's uniform, formal grammar has strict rules! When a preposition is moved to the front of a relative clause, it can only be followed by which (for objects like glasses) or whom (for people like dignitaries).
"In that" and "to who" are grammatically incorrect.
The sentence ending in "...resides in" is grammatically acceptable in standard English, but it strands the preposition at the end, failing Mr. Belvedere's strict formal requirement.