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Help the detective finalize her report by selecting ALL the grammatically correct ways to report the clumsy art thief's words.
Direct speech: "Where shall we stash the stolen painting? It must be kept away from sunlight!"
The correct answers are: The thief asked his accomplice where they should stash the stolen painting, emphasizing that it had to be kept away from sunlight. The thief asked his accomplice where they should stash the stolen painting, emphasizing that it must be kept away from sunlight.
When reporting "shall" used for asking for advice or suggestions, it generally changes to "should".
When reporting "must" for obligation, you can either change it to "had to" or leave it as "must".
"Shall" does not remain "shall" in this reported context, and "must have been" incorrectly changes the meaning to a past deduction rather than a present/future obligation.