No answer is correct because we can sort data type such as primitive types such as double and string we can not directly sort user-defined class but we need to implement < operator, or Comparable interface, for sorting user-defined classes so, we can sort double, string, user-defined class, etc..
What is Data Type in Programming?
In programming, a data type is a classification that specifies what type of value a variable has and what mathematical, relational, or logical operations can be performed on it without causing an error. A string, for example, is a data type used to categorize text, whereas an integer is a data type used to categorize whole numbers.
Examples of Data Type are -
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