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 is looking for the section of the text that will catalog for her the properties that tell her whether a user to her site is using Internet Explorer,for example,and what version thereof.Under which of the following objects should she look to learn how to accomplish this?

A) navigator
B) location
C) array
D) browser