Which three object types can you use?

A web application has a web page that contains an HTML5 CANVAS element. A web worker extracts
messages from the CANVAS element.
You need to ensure that the web worker can read the message sent by the web page.
Which three object types can you use? Each correct answer presents a complete solution.

A.
JSON

B.
parent

C.
JavaScript

D.
window

E.
string

F.
DOM

Explanation:
https://www.html5rocks.com/en/tutorials/workers/basics/