We will consider the following network for understanding how a path is choosen in STP.

We assume that TK5 switch is the root for all VLANs. We have to find a valid path from PC TK II to the server TKA. As TK5 is the root for all the VLANs, all the decisions regarding blocking and forwarding ports will be with reference to this switch. So, ultimately the network would become as follows: (CROSS shows that path which will be blocked).