reccomended antenna/chain setup for rb751g-2hnd

Hi guys, im wondering what the recomended setup for this router is.

This has 2x2 mimo right? So should be antenna b - both chains enabled on rx and tx right?

found my answer in the manual; antenna A is for internal antenna’s. should all 4 chains be active still?

looks like it behaves properly with all 4 chains. Case closed!