Flash Card Q & A

What's wrong with this script?:

function flipCard(button) {
let p = document.getElementById('card1');
button.textContent = 'Success1!';
}

function flipCard(button) {
let p = document.getElementById('card2');
button.textContent = 'Success2!';
}
A variable declared OUTSIDE of a function is considered a(n) _____. let and const are alternatives to _____.