Which two code fragments represent these relationships?

Given that: Gadget has-a Sprocket and Gadget has-a Spring and Gadget is-a Widget and Widget
has-a Sprocket Which two code fragments represent these relationships? (Choose two.)

A.
class Widget { Sprocket s; }
class Gadget extends Widget { Spring s; }

B.
class Widget { }
class Gadget extends Widget { Spring s1; Sprocket s2; }

C.
class Widget { Sprocket s1; Spring s2; }
class Gadget extends Widget { }

D.
class Gadget { Spring s; }
class Widget extends Gadget{ Sprocket s; }

E.
class Gadget { }
class Widget extends Gadget{ Sprocket s1; Spring s2; }

F.
class Gadget { Spring s1; Sprocket s2; }
class Widget extends Gadget{ }