Final answer:
The best TrueView format and bidding approach to drive action is TrueView for action and Target CPA bidding.
Step-by-step explanation:
To drive action, the best TrueView format and bidding approach would be option 1) TrueView for action and Target CPA bidding. This combination allows you to optimize your video ads for specific actions, such as clicks or conversions, and set a target cost per action. Target CPA bidding uses historical performance data to automatically set bids that will help you achieve your desired cost per action.