You’re new to the concept of customizing attribution models in Display & Video 360 and are just learning how the available options work. What statement accurately defines your options?

When some conversions can’t be observed and attributed directly, conversion modeling helps fill the gap.
Conversion modeling and viewable view-through conversions (VTCs) can’t be enabled on the same attribution model.
Enabling viewable view-through conversions (VTCs) is only possible on a Last Interaction attribution model.
Viewable view-through conversions (VTCs) gives twice as much attribution credit to viewable impressions.

The correct answer is:

When some conversions can’t be observed and attributed directly, conversion modeling helps fill the gap.