What is the default wait time for STP convergence to complete?

A. Convergence takes 60 seconds to complete.
B. Convergence takes 5 seconds to complete.
C. Convergence takes 30 seconds to complete.
D. Convergence takes 50 seconds to complete.

D. 802.1d STP convergence takes 50 seconds to complete before the port is put into a state of forwarding or blocking. This is dependent on the STA, or spanning-tree algorithm.