Answer: A) Implicit data type conversion is performed when you mix values of different data types in an expression.
Explanation: Implicit data type conversion is the conversion done by mixing up of different types of data types which don't lose their actual significance. The originality remains same while changing the datatype.It is also known as implicit type casting.
Other options are incorrect because implicit data type cannot be implemented on every data type,significance values don't get change while changing data type and implicit casting occur when difference in data types is present.Thus the correct option is option(A).
Implicit type casting means conversion of data types without losing its original meaning. This type of typecasting is essential when you want to change data types without changing the significance of the values stored inside the variable.