Which subdevice to use

Hi All,

i got the gnuradio companion to work, therefore
i test the example <usrb_wbfm_receive.grc>.

Which subdevice is the right one for me ?

usrp_diagnostics doesn’t show me, which one is
the .
What means A:0 ?
‘A’ is the Daughterboard and ‘0’ is the input/output ?

I have 3 daughterboards on my USRP. Here is a Picture:
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Regards Markus