The app builder has two options available when defining an object-specific Create Record custom action:
Pre-Defining field values on the target object. This means that the app builder can specify default values for certain fields on the target object when creating a new record using the custom action.
Specifying the fields and layout of the action. This means that the app builder can choose which fields to include in the action and how they are arranged on the screen. Option B and D are not options available when defining an object-specific Create Record custom action.