[SH] NL50 K9s in 4bet pot

30 hands on villain, has 3bets from the blinds only until now

I think hisrange for calling my 4bet OOP are mostly PP. Occasionaly some slowplayed AA. (altough he called quickly) And maybe some SC.

Best line after the flop?

1. bet flop/ shove turn
2. bet flop / check turn / shove river
3. check flop/ bet turn /shove river

MP: $69.31 (138.6 bb)
Hero (CO): $50 (100 bb)
BTN: $60.10 (120.2 bb)
SB: $89.95 (179.9 bb)
BB: $50 (100 bb)

Preflop: Hero is CO with K 9
MP folds, Hero raises to $1.50, BTN folds, SB raises to $4.50, BB folds, Hero raises to $10.75, SB calls $6.25

Flop: ($22) K 3 5 (2 players)
SB checks, Hero checks

Turn: ($22) 7 (2 players)
SB checks, Hero bets $12, SB calls $12

River: ($46) 3 (2 players)
SB checks, Hero bets $27.25 and is all-in, SB calls $27.25