Answer is B
Spanning Tree Protocol (STP) convergence (Layer 2 convergence) happens when bridges and switches have transitioned to either the forwarding or blocking state. When layer 2 is converged, Root Switch is elected and Root Ports, Designated Ports and Non-Designated ports in all switches are selected. At Converged condition, the Root Ports and the Designated ports are in forwarding state, and all other ports are in blocking state.
I believe that the answer is A, given that the cost is determined first before a designated port can be elected. Of course, the port with the lowest cost and interface/switch ID, that would be the designated one.
http://www.omnisecu.com/cisco-certified-network-associate-ccna/how-spanning-tree-protocol-stp-select-designated-port.php
The correct answer is B. electing designated ports
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