With Which rook will you take ? And Why ?!

With Which rook will you take the bishop ?
I want to understand this position . Why Rbxb2 ?

Rb8 and Rxf7!?

Hello,
i followed the line of Stockfish for that position and will try to explain it. Rb1xb2 has the advantage that it threatens Ra2 and the a pawn runs possibly to promotion. Therefore black has to take it immedeately Rxa5. Now the f7 pawn is under attack, only protectet by the king. Rb8+ drives the king away. Kh7, only move. Rxf7 a pawn is a pawn. Now white threatens to double the rooks on the 7. rank. How can black defend the g7 pawn? Ra4 prepares for Rg4 to defend g7. Rb8-b7, Rg4 Kf2. Now look how black nearly runs out of moves the Knight has nowhere to go and the Rook is trapped and soon attacked by the pawns on the g- and h-file supportet by the white King. Sorry that English is not my main language. Greatings

You want one rook on the F file so that after your opponent takes your A pawn you still remain +3 with Rb8+ Kh6 and Rxf7

oh wait Sarg0n already said it.

So did joergg.

Thank you so much guys