3NT. You have both unbid suits stopped and a balanced minimum. Yes, the aces are nice, but you have to limit your hand. Bidding 3 of a major might get your partner to go past 3NT if she is worried about the other major. For example, if you bid 3, partner will bypass 3NT with something normal like:
The 2 (standard) is led. Dummy plays low and RHO plays the Q. What is your plan?
Choose One:
Win the A and run the clubs.
Win the A and take a diamond finesse.
Let the Q win the trick.
Answer: 2 -
Win the A and take a diamond finesse. The 2 lead tells you the suit is 4-4. There is no reason to hold up. If you do, a heart switch could be damaging. If the diamond finesse wins, you have plenty of tricks regardless. If it loses, the worse that can happen is you will lose the K and only 3 spade tricks. You shouldn't run clubs first because then if the diamond finesse wins, you have to come back to the A to repeat the finesse (and a tricky opponent who holds up the offside K would then be able to run both majors against you).
Below is the full deal. If you make a holdup play, East shifts to hearts and you are down one.