What are the keywords used to define user-defined functions in C programming?

Explanation

In C programming, user-defined functions are created using a function header that includes the following elements:1. Return type: The return type specifies the data type of the value that the function will return. Common data types used for return types include int (integer), float (floating-point number), char (character), and void (meaning the function does not return a value).2. Function name: This is a unique identifier that you choose to name your function. It should be descriptive and reflect the function's purpose.3. Parameter list (optional): This list includes the parameters (arguments) that the function can accept. Parameters are variables that are used to pass data into the function. Each parameter has a data type and an optional name.Here's an example of a user-defined function in C:Cint add(int x, int y) { // function body return x + y;}In this example:• int is the return type, specifying the function will return an integer value.• add is the function name.• int x, int y is the parameter list, where x and y are integer parameters