4b/c seems optimistic but against someone who would shove A2s-A5s/AK-AQs/99+ seems ok. My general ranking is fold > call > 4b/c > 4b/f. Calling may have the EV decreased if MP+1 would play this spot more aggressively than the population.

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Flat pre and play like a pissed off old guy with your check calling range postflop.

if its 1v1 that is

Ooops, meant to quote your comment, not flag it. I dont see how 4b/c is profitable nless theyre a Brazilian shove monkey and u have a dynamic.

But above advice is bttr, this is more of a question, I havent been on Stars in some time.

We need 33% equity to 4bet/C, so we need a 5bet range of yeh just did it. 4b/ call may be optimal then. I doubt both MP folders fold so we cant get that 1v1 dynamic post/wider btn cbetting range.

4b/c seems disaster
call and play postflop, think about 4b/f but really im not fan of turning TT in bluff here

Yeh actually agree with Chester. Changing my mind like the fish I am again.

Its 20-40 pre ante. No need to pile it in by 4bet/c vs a 5bet range thats mostly tha nuts.
They should play more honest in a 4 way pot also which helps r equity to flat pre.