When a computer is connected to an interface with RSTP enabled in default mode, which is the correct order of the port transitions?

A. Discarding, learning, blocking, forwarding
B. Discarding, listening, forwarding
C. Blocking, listening, learning, forwarding
D. Discarding, learning, forwarding

D. RSTP has three transitions when a computer is plugged in (no loops). The transitions are discarding, learning, and forwarding, which allow for rapid convergence times.