"Composite materials are materials made from two or more constituent materials with significantly different physical or chemical properties, that when combined, produce a material with characteristics different from the individual components"

So a fiberglass fuselage, sandwhich constructed fuselage/wings, anything of that nature that requires the addition of another material to change its physical properties is considered a composite airframe.

Now, Two, Three and Six are not "composite" airframes IMO, but they utilize composite materials. IMO in order to be considered a composite airframe, the bulk of the airframe must be composite (wings, fuselage, tail, etc)