Point out the correct statement.
(a) Exit code 10 is for abnormal exit
(b) 4 is returned when the version of the database is different from the version supported by the mongod (or mongod.exe) instance
(c) The server socket is on port 27017 by default
(d) None of the mentioned
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I'm obligated to ask this question of Exit Codes and Statuses topic in division Production Checklist, Security Concepts and Network Security of MongoDB