Consider the following pseudo Java code. Which of these options is valid in Java?

	a.	class Vehicle { . . . } class Car extends Vehicle { . . . } class Boat extends Vehicle { . . . } class AmphibiousVehicle extends Car, Boat { . . . }
	b.	interface Vehicle { . . . } interface Car extends Vehicle { . . . } interface Boat extends Vehicle { . . . } interface AmphibiousVehicle extends Car, Boat { . . . }
	c.	class Vehicle { . . . } abstract class Car extends Vehicle { . . . } abstract class Boat extends Vehicle { . . . } class AmphibiousVehicle extends Car, Boat { . . . }
	d.	All of these above
	e.	None of these above