Consider the following class hierarchy: public class Vehicle { private String type; public Vehicle(String type) { this. type = type; } public String getType() { return type; } } public class LandVehicle extends Vehicle { public LandVehicle(String type) { . . . } } public class Auto extends LandVehicle { public Auto(String type) { . . . } } Which of the following code fragments is NOT valid in Java? a) Vehicle myAuto = new Auto("sedan"); b) LandVehicle myAuto = new Auto("sedan");c) Auto myAuto = new Auto("sedan"); d) LandVehicle myAuto = new Vehicle("sedan"