Which namespace should you use?

You are developing an application page.

You need to create a pop-up window that uses the ECMAScript object model.

You are developing an application page.

You need to create a pop-up window that uses the ECMAScript object model.

Which namespace should you use?

A.
SP.UI.Menu

B.
SP.UI.ModalDialog

C.
SP.UI.Notify

D.
SP.UI.PopoutMenu

Explanation:
MNEMONIC RULE: “pop-up window = ModalDialog”

SP.UI.ModalDialog Class
http://msdn.microsoft.com/en-us/library/ff408909.aspx