Final answer:
The two bidding types for TrueView for action are Target CPA bidding, aiming for as many conversions as possible at a set cost-per-acquisition, and Target ROAS bidding, which maximizes conversion value based on the desired return on ad spend.
Step-by-step explanation:
The two types of bidding available for TrueView for action to help drive conversions are Target CPA (Cost-per-acquisition) bidding and Target ROAS (Return on Ad Spend) bidding. Target CPA is a bidding strategy that sets bids to help get as many conversions as possible at the target cost-per-acquisition you set. On the other hand, Target ROAS focuses on return on ad spend, which means the bidding strategy automatically sets bids to maximize conversion value based on the return you want from your ad spend.