Problem $1-$ Object Oriented Databases

Consider the following class hierarchy.

a$.$ Add $3$ Attributes $(//$Variables$)$ and $2$ Methods $(//$Messages$)$ for Vehicle, Car, and Truck.

b$.$ Write the class definition SQL for Vehicle, Car, and Truck.

c$.$ Write a class hierarchy definition SQL for this class.

$($An instruction that isn't written is that the command "create table" isn't applicable here as this is an object orientated database, not a relational database$)$