I agree with the OddOne, study using the many quality teaching CDs and text books available. There are are too many poor teaching aids on the market which should be avoided. It is correct that all gyros exploit the principles of rigidity. The quoted question is nonsense.
I'm not so exercised about renaming the Artificial Horizon (AH) to a attitude Indicator (AI) which is the case for modern instructing but rarely elsewhere. The instrument displays an artificial horizon after all and is used to set the aircraft attitude in pitch and roll. Manufacturers and retailers in the main continue to use the older term. The change from Direction Indicator (DI) to Heading Indicator (HI) in my view is correct because the heading v direction is not always the same, correctly aligned this instrument displays the heading only not direction of travel.