I can't figure out the DOM but I don't understand, what's wrong?

Question

JavaScript

Task description:

Select 3 DOM elements:
- move to the element with id = "test" and assign the selected element to change id.

- return to element after class class = "test" and assign selected element to change className

- return to element after tag and assign selected element to change tag

My Response:
var test = document.getElementById("test");
var test = document.getElementByclassName("test");
var_tag = document.getElementByTagName("div");

Answer 1

var id = document.getElementById("test");
var className = document.getElementsByClassName("test");
var tag = document.getElementsByTagName('div');
Here is the correct answer.