Manipulate the DOM

Question 1
Which of the following functions will return a collection containing all <p> nodes within the document?
- Both document.getElementsByTagName('p'); and document.querySelectorAll('p');
- Both document.getElementsByClassName('p'); and document.getElementById('p');
- Only document.querySelector('p');
Question 2
Select the three functions below which will return the paragraph <p> with id main-article .
Attention, plusieurs réponses sont possibles.
- document.getElementsByTagName('main-article');
- document.getElementById('main-article');
- document.querySelector('p#main-article');
- document.querySelector('p.main-article');
- document.querySelector('#main-article');
Question 3
Which of the following functions will return a collection containing all <li> nodes (and ONLY <li> nodes) of class list-item-active ?
- document.getElementById('list-item-active');
- document.querySelectorAll('li.list-item-active');
- document.getElementsByClassName('list-item-active');
- document.querySelector('li.list-item-active');