Which of the following comparison operators in JavaScript checks if two values are not equal and also checks for their data types?
!=
!==
==
===
The correct answer is A2: !== which is the strict inequality operator in JavaScript. It checks if two values are not equal and also compares their data types. If the values are not equal or have different data types, it returns true. The other options are incorrect: != is the inequality operator, which checks if two values are not equal but does not compare their data types, == is the equality operator, which checks if two values are equal but does not compare their data types, === is the strict equality operator, which checks if two values are equal and also compares their data types. However, the question specifically asks for the operator that checks for inequality.