How can you ensure that your functions will be available before any user event can call a function?

• A. Define all your functions in the head section of your HTML page.
• B. Place all functions at the end of the body
• C. Use inline event handlers
• D. Load external script asynchronously

Answer: (A)

Defining all your functions in the head ensures they exist and are initialized in the global scope before any user interaction occurs. When the browser parses the head, it runs that JavaScript first, so the functions are available as soon as the page starts, and any events you wire up later can call them without running into undefined errors.

Other approaches can introduce timing risks: placing scripts at the end of the body means the functions aren’t guaranteed to be defined until the entire page has been parsed, inline event handlers rely on the function being defined at the moment the event fires, and loading external scripts asynchronously might delay the function being available until after the user already interacts with the page.