I have never heard of "CTX" it's possible that's just a typo. The "BTX" stands for "banana technology" which is their reverse camber shape. The "C2" designates two camber zones outside the binding insert packs. EC means elliptical camber on some of their boards (like the Attack Banana EC2BTX etc.)
Riders Choice probably not the greatest board for a beginner I think you would save a bunch of $$$ and might be better suited on the Gnu Carbon Credit BTX.