Final answer:
Performing a comprehensive safety inspection and offering a discounted maintenance plan are the best ways to ensure that a vehicle is delivered as promised.
Step-by-step explanation:
To best ensure that a vehicle is delivered as promised, performing a comprehensive safety inspection is the most important step. This involves thoroughly checking the vehicle for any potential issues or defects to ensure that it is in proper working condition.
Additionally, offering a discounted maintenance plan can provide further assurance to the buyer that any future maintenance or repairs will be taken care of at a reduced cost.
While providing an extended warranty package and demonstrating all entertainment system features are beneficial, they are not as crucial in ensuring the actual delivery of the vehicle.