NL100 AK marginal spot vs 50bb`s?!

[ComputerMaster]

I was new to the table and villian unknown. The reraise preflop is clear. Question is, do I am already committed to the pot? Clearly yes, if i´m going to cbet 3/4pot, but can i just c/f or even c/c here?

Hold'em, $1 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

<font color="#C00000">Hero ($100)</font>
BB ($32.66)
UTG ($118.48)
MP ($149.50)
<font color="#C00000">CO ($52.40)</font>
Button ($70.96)

Preflop: Hero is SB with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">CO raises to $3</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $12</font>, <font color="#666666">1 fold</font>, CO calls $9.

Flop: ($25) J[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $20</font>, CO calls $20.

Turn: ($65) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero calls $99.50 (All-In), CO calls $20.40 (All-In).

River: ($169.80) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players, 2 all-in)</font>

Final Pot: $169.80