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Instance exits cleanly are represented by ___ exit code.

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Instance exits cleanly are represented by ___ exit code.

(a) 4

(b) 1

(c) 2

(d) 3

I had been asked this question in exam.

Question is taken from Exit Codes and Statuses topic in section Production Checklist, Security Concepts and Network Security of MongoDB

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Right option is (a) 4

To elaborate: Restart mongod with the –upgrade option to upgrade the database to the version supported by this mongod instance.

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