With neither side vulnerable, you are in 3rd seat holding:
Partner opens 1 and RHO passes. What is your response?
Partner bids 1 as shown and it is your turn.
Partner bids 2NT as shown. And you?
Partner passes. Let's hop over to his seat so we can play it with the J lead as shown. What is your plan?
Play low from dummy.
Win the A and play the 9.
Win the A and play diamonds.
Win the A and play clubs.
RHO plays low. And you?