Javascript Wait Var

Question

This code does not work:

var wait = 3000
sleep(wait);
document.write("it has been 3 seconds")

Answer 1

var wait = 3000
setTimeout(function(){
document.write("it has been 3 seconds")},wait);

Answer 2

var wait = false
if (wait = false) {
wait = true;
setInterval(function(){
document.write("it has been 3 seconds"); wait = false;},3000); }

Answer 3

setTimeout(function(){
document.write('it has been 3 seconds');
}, 3000);

Answer 4

None of these work