Case 9-1 A Friend of Libby's Has Given Her a Great Reference

Case 9-1
A friend of Libby's has given her a great reference text for JavaScript,including a handy section on built-in objects.However,Libby's challenge is that because she is so new to JavaScript,she does not know the appropriate section in which to look in the first place when she knows the type of task she wants to perform.
-Libby wants to be able to make some changes to her Web page based on the content of a given user's browser window.Under which of the following headings in her reference text would she find the relevant properties and methods?

A) browser
B) navigator
C) document
D) screen