Which is a valid definition of an interface called Transportable given another valid interface, Movable?

Which is a valid definition of an interface called Transportable given another valid interface,
Movable?

A.
class Movable extends Transportable { /*…*/ }

B.
interface Transportable extends Movable { /*…*/ }

C.
class Movable implements Transportable { /*…*/ }

D.
interface Transportable implements Movable { /*…*/ }