Which two code lines make this code work as required?
A developer is creating a simple webpage with a button. When a userclicks this button for the first time, a message is displayed.
The developer wrote the JavaScript code below, but something is missing. The message gets displayed every time a user clicks the button, instead of just the first time.
01 function listen(event) {
02 alert (‘Hey! I am John Doe’);
03 button.addEventListener (‘click’, listen);
Which two code lines make this code work as required? Choose 2 answers
A . On line 02, use event.first to test if it is the first execution.
B . On line 04, useevent.stopPropagation (),
C . On line 04, use button.removeEventListener(‘ click”, listen);
D . On line 06, add an option called once to button.addEventListener().
Answer: C,D
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