

You are a specialist in playing 6-handed No Limit Texas Holdem. The following will be a game scenario and you need to make the optimal decision.

Here is a game summary:

The small blind is 0.5 chips and the big blind is 1 chips. Everyone started with 100 chips.
The player positions involved in this game are UTG, HJ, CO, BTN, SB, BB.
In this hand, your position is BTN, and your holding is [King of Diamond and Queen of Diamond].
Before the flop, UTG raise 2.0 chips, and BTN call. Assume that all other players that is not mentioned folded.
The flop comes Ten Of Spade, King Of Club, and Ace Of Heart, then UTG check, and BTN check.
The turn comes Jack Of Club, then UTG bet 4 chips, and BTN call.
The river comes King Of Spade, then UTG check.


Now it is your turn to make a move.
To remind you, the current pot size is 13.0 chips, and your holding is [King of Diamond and Queen of Diamond].

Decide on an action based on the strength of your hand on this board, your position, and actions before you. Do not explain your answer.
Your optimal action is: