Playing for the first time with an advanced/expert partner, you've agree to play minor suit transfers over 1NT, say 2♠ for clubs (may or may not contain balanced invites) and 2NT for diamonds. You've even discussed what opener's answers to them mean, but not what responder's rebids show. It goes 1NT-2♠-3♣-3M and you assume partner is showing...

(I've always assumed one of the below answers is absolutely standard but I've recent come across quite a few people using another meaning so I thought I'd better check.)

Please give your assumption as to what's standard as a poll answer but feel free to discuss what you consider optimal in the comments.

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