有以下函数，这3个函数中哪个能够访问外部范围变量？

clickHandler，immediate和delayedReload：
let countClicks = 0;
button.addEventListener('click', function clickHandler() {
  countClicks++;
});
const result = (function immediate(number) {
  const message = `number is: ${number}`;
  return message;
})(100);
setTimeout(function delayedReload() {
  location.reload();
}, 1000);