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Which of these is a read only variable?

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Which of these is a read only variable?

(a) error_count

(b) big_tables

(c) autocommit

(d) foreign_key_checks

The question was asked in an online interview.

Enquiry is from Session-Only System Variables topic in chapter System, Status and User Variables of MySQL

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The correct choice is (a) error_count

The explanation: The session only system variable ‘error_count’ is a read only variable that indicates the number of errors generated by the last statement that can generate errors. The others are writable.

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