What does Rainbow Dragon's effect work when it gains attack?

Question

Rainbow Dragon's first effect says you can send all CB monsters you control to graveyard to have Rainbow Dragon gains 1,000 ATK for each. But does that just include the monster card zone or does it include the CB monsters you control in your s/t card zone.

Answer 1

it says crystal beast monsters, so you only send away crystal beasts that are monsters to boost its atk

Answer 2

exactly as it says, send all Crystal Beast MONSTERS you control to the graveyard.

CBs are treated as continuous spells while in the s/t zone so Rainbow only absorbs CB monsters.