You are implementing the math library for a game engine.
You need to find a solution that stores transform information by using only four floats.
Which solution should you use?

A.
quaternions

B.
4×4 matrix

C.
3×3 matrix

D.
Euler angles

Explanation:
http://blogs.msdn.com/b/rezanour/archive/2012/04/29/math-primer-series-rotationrepresentations-and-quaternions.aspx