

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 CO, and your holding is [Ace of Club and Eight of Diamond].
Before the flop, CO raise 2.3 chips, and BTN call. Assume that all other players that is not mentioned folded.
The flop comes King Of Spade, Seven Of Heart, and Two Of Diamond, then CO check, BTN bet 2 chips, and CO call.
The turn comes Six Of Heart, then CO check, BTN bet 8 chips, CO raise 25 chips, and BTN call.
The river comes Four Of Heart, then CO bet 30 chips, and BTN raise 70 chips.
You currently have High Card(A-high).

Now it is your turn to make a move.
To remind you, the current pot size is 158.0 chips, and your holding is [Ace of Club and Eight of Diamond]. You currently have High Card.

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: