Which among the following is the correct syntax for defining "Constraint Check" in Mysql?

This question asks about the way to define a "Constraint Check" in MySQL. A constraint check is like a rule that makes sure the data you put into a table is correct.
Let's break down the options:
Option A: gender char(1) check( gender IN ('M', 'F'))
This is the correct syntax!
* gender char(1) defines a column named "gender" that can store a single character (like 'M' or 'F').
* check( gender IN ('M', 'F')) is the constraint check. It ensures that the value entered in the "gender" column must be either 'M' or 'F'.
Option B: gender char (1) check
This is incorrect. It's missing the condition inside the parentheses that defines the check.
Option C: gender char (1) check ( gender )
This is also incorrect. The condition "gender" isn't enough to define a proper check. It needs to specify what values are allowed.
Option D: none of the mentioned
Since Option A is correct, this is incorrect.
In summary, Option A is the right way to define a "Constraint Check" in MySQL. It makes sure that the data entered into the "gender" column follows the specific rules defined by the check.