You open under the gun with AQ Diamond and get called by the Hijack and the Small Blind. The flop comes QT9 for top pair with top kicker and the nut flush draw. You bet half pot and the SB check raises pot, which you call. The turn is blank (2 of spades). The SB checks, and you are now facing four options: Should you check, bet Half Pot, bet Pot or go All-In?