Option B seems tempting, but in reality, the service doesn't really 'select' the protocol. It's more like the protocol chooses the port, like a blind date with a pre-determined dinner spot.
Haha, this is a classic networking question. I bet the person who wrote it spends their free time playing Dungeons & Dragons and arguing about port forwarding.
I agree, D is the right answer. The service uses the port as the entry point for network communication. It's like a designated mailbox for the service to receive messages.
Option D is clearly the correct answer. A service opens a port and listens for incoming traffic. It's like a door that the service keeps open to receive visitors.
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