Synchronous calls can only be used with certain programming languages? That doesn't sound right to me. I'm pretty sure the key things are that they block the application and can add latency. I'll go with those.
Okay, I've got this. SSH stands for Secure Shell, and it's a common protocol for remote access. The default port for SSH is 22, so I'm going to select option D.
This question seems familiar; I think it might be like one of those practice questions where the answer was to process the packet in a similar scenario.
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