Hero BTN with A♣A♠, 50bb behind

Multi-way Flop | 3-way: BTN | 75bb effective | Difficulty: Tough

Players in hand: Hero (BTN, 4-bettor), UTG (3-bettor), SB (cold 4-bet caller)

Hero hand

A♣A♠

Board

K♥9♣4♦

Action so far:
Three-way 4-bet pot, flop K♥9♣4♦
SB c-bets 25bb, UTG folds
Hero BTN with A♣A♠, 50bb behind

Pot: 75bb   To call: 25bb

Villain range: SB cold 4-bet range: KK, QQ, AKs, sometimes JJ, AKo. C-bet on K-high flop multi-way: weighted to KK (combo blocker), QQ, AK.

Your move: