Responding to 2NT

Playing matchpoints. Both sides are vulnerable.

Here is your hand:
♠QT75
♥AK76
♦KQ
♣AK2

Three Passes to you. You have a balanced hand with 21 High Card Points. You decide to open 2NT which you play as showing 20 or 21 HCP. The Opponents are silent during the auction. You have agreed to play both Stayman and Jacoby Transfers over any NT opening and Partner bids 3♣.

What is your call?

Show Answer

3♥

Just like Responder bids their four card suits up the line so do you when you are answering Stayman. This shows four ♥ but does NOT deny having four ♠.