Given concrete class B is a subclass of concrete class A, and class A implements interface C, which two are examples of polymorphism? (Choose two.)

Question

Options

• Ause a reference variable of type C to refer to an instance of type B
• Buse a reference variable of type A to refer to an instance of type C
• Cuse a reference variable of type C to refer to an instance of type A
• Duse a reference variable of type A to refer to an instance of type B
• Euse a reference variable of type B to refer to an instance of type A

• A
  72% (47)
• B
  5% (3)
• D
  8% (5)
• E
  15% (10)

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