Which statement is NOT true about variables in programming?

The statement that a variable can have a fixed value is not true in the context of most programming languages. In general, a variable is designed to hold a value that can change over time as the program runs. This characteristic allows variables to represent dynamic data.

The other statements accurately describe the nature of variables. A variable retains its value until it is modified by the program, showcasing its ability to hold data temporarily. Additionally, a variable is inherently not a fixed value, as its purpose is to be flexible and support changes as the program logic dictates. Furthermore, the nature of variables being able to change during program execution is fundamental to how programming works, allowing developers to create dynamic applications that can respond to various inputs and conditions during runtime.