Mother and Father divorce. Father gives Son a Chevrolet Camaro for his 17th birthday. Son lives with mother and Son keeps the car at home. Son pays for all gasoline and maintenance on the car. However, Father's name is on the title of the car. Which element of a gift is most likely missing if someone challenges Son's ownership of the car?

Acceptance by the donee

Delivery to the donee

Capacity of the donor

Intent to make a gift