D is the correct.
In Rapid Spanning Tree Protocol (RSTP), there are only 3 port states:
Discarding: Port doesn't forward traffic or learn MAC addresses.
Learning: Port doesn't forward traffic but learns MAC addresses.
Forwarding: Port forwards traffic and learns MAC addresses.
STP has five port states; blocked, listening, learning, forwarding, and disabled. There are only three port states in RSTP ; discarding, learning, and forwarding.
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