{"criteria": {"c1": "not_met", "c2": "met", "c3": "not_met", "c4": "not_met", "c5": "not_met"}, "note": "Uses a thread per client with no select at all (violating the select/no-threads requirement); there is no select set to remove clients from; the listen backlog of 64 is not a connection limit and no rejection message is sent; the test is a one-sentence description with no code and no cleanup check."}