They can connect to any switch that shares the switch fabric.
Switch A is the vtp server, you create a wireless management vlan, then you configure the 3750 swith as a vtp client in the same vtp domain as the vtp server. You will also create the trunk ports for the 3750/WLC communications and then you will place any switch port that an AP connects to on any switch in the vtp domain and then configure that particular port in access mode and placed in the wireless management vlan.
That is the most simplistic way of doing it, there are other options such as h-reap, but a quick view of the cisco docs will give you some guidance.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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