What type will be returned when executing the sayHi function that returns an immediately invoked function expression?

The correct understanding of the scenario surrounds the behavior of immediately invoked function expressions (IIFE) in JavaScript. When a function is defined and executed immediately with parentheses, it returns the result of that function's execution.

If the sayHi function is structured to return a value through an IIFE, the returned type would depend on what is explicitly returned from inside that IIFE.

For example, if the IIFE returns a value like a string or a number, then that would be the type returned by sayHi. If the IIFE does not return anything or has no return statement, the default return type would be undefined.

In contrast, if it returned a numerical expression within the IIFE, then it would indeed return a number. If the immediate function was structured to return a new function or object, it would return a type of function or object, respectively.

Understanding the context and structure of the sayHi function will clarify what has been implemented as the return type. Hence, the response relies on the expected inner workings of the sayHi function itself and the content of the IIFE.

To summarize, if sayHi is set to return a numerical value inside its IIFE, then the return type would be a number, making