What are the restrictions on closed questions?

Question

Let's say A is somebody that asked a question. B is somebody that gave an answer. C is somebody that didn't.

The question gets closed.

Presumably, C cannot post an answer.

A can comment.

Can B or C comment?

Any other info on restrictions to "writing" to the closed question thread?

Answer 1

You cannot post a new answer on a closed question. That is about it.