JavaScript Code Output Challenge - javascript nested function

What is the output of the following code?

function outerFunction() {
  var x = 10;

  function innerFunction() {
    var y = 5;
    console.log(x + y);
  }

  innerFunction();
}

outerFunction();

undefined

Correct: B

The code defines a nested function innerFunction inside outerFunction. When outerFunction is called, innerFunction is also invoked, and x (defined in outerFunction) has a value of 10, while y (defined in innerFunction) has a value of 5. Therefore, the sum of x and y is 15, which is printed to the console.

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