To me, this setup is not as straightforward as it first appears. Carom is the wrong shot in this situation. You can't guarantee another shot on the 2 afterwards. The bank is the wrong shot even though it provides excellent position on the gimmie 3 afterwards. The hook behind the 9 after the bank is not that easy a proposition.
The combo is the only sure choice. However, the combo itself is a little tricky. At first glance, I would want to go two rails around to the center of the table. That, would be quite difficult to achieve. That is because of the thinness of the hit on the two means that it's tangent line is about a half diamond to a quarter diamond on the short rail towards the tow from center line table.
That means that you would need a lot of outside spin, and even then, odds are you will hit the 6. Don't want to move the 6 in this situation, as I could easily block the cb from the 4 if the 2 and 3 both fell. No need to take that chance.
So, shooting the combo- simple to make the 3. But, you have to pay much more attention to detail than that. You have the possibility of making both balls, so you also have to play shape on the 4, and on the two if both don't fall.
You also have to fine tune your aim to hit the 3 properly. If you come in short, and hit the short rail first, then the 3, the 2 will move up the long rail. No problem. But, if you hit the long rail side of the 3 with the 2, the 2 will move back along the short rail, and you have a much better chance of no shot, or a much tougher shot than was needed.
So, we have the combo shooting to the short rail, or center of the 3. Now, we look at where the cb is going to go naturally. We are looking at hitting the 9, to just missing the 9 on the "6ball" side, using no english. Remember, first instinct was to two rail the cb. That doesn't look so promising now. So, I will use inside english, with a draw drag shot to slow down the cb. I will either come inside the 9, or will hit the 9 and send it towards the side pocket.
I only want to hit it just hard enough to make the combo. I don't want the cb flying around on this shot. The carom off the 9 can also put me in trouble, but I can control that with my speed.
So, combo, inside draw drag with pocket speed.