When the ________ is placed in front of a variable name, it returns the address of that variable.

Developed by Google, ____ is a mobile OS based on Linux designed to run on many types of smartphones and tablets.?

A. ?Android B. ?iOS C. ?Windows Phone D. ?Blackberry

Property keyframes contain the specific property values that change in a frame, including all of the following EXCEPT ____.

A. skew B. filter C. index value D. position