Which of the following is NOT a valid data type that a variable can hold?

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In programming, variables are used to store data, and each variable must have a specified data type that determines the kind of data it can hold. The common valid data types are:

String: This data type is used to represent sequences of characters, such as text. For example, "Hello World" is a string.
Number: This encompasses both integers and floating-point numbers, which can represent both whole numbers and decimal values. For example, 42 and 3.14 are both valid numbers.
Boolean: This data type can hold one of two values, typically true or false. It is essential for controlling the flow of a program through conditional statements.

The term "Const" is not a data type; rather, it is a keyword used to define a constant value that cannot be altered once assigned. Constants can hold values of valid data types but do not themselves constitute a data type. Therefore, it is accurate to say that "Const" is not a valid data type that a variable can hold.