What does a function signature include?

A function signature is a crucial aspect of defining a function in programming, as it provides essential information about the function's interface without delving into its implementation details. The correct choice emphasizes that a function signature includes the function's name, return type, and parameters.

The function's name uniquely identifies it, allowing the programmer to call it from different parts of the code. The return type indicates what kind of value the function will return to the caller. This is important for the caller to know what to expect after invoking the function. Lastly, the parameters listed in the signature specify the inputs the function requires, which can vary in number and data type. Together, these elements provide a complete overview of how to use the function effectively.

Understanding this structure helps in designing and utilizing functions correctly within a program, enhancing readability and maintainability of code. Having accurate and informative function signatures is a foundational practice in programming, allowing for better collaboration and understanding in codebases, especially in larger projects.