Which three are true? (Choose three.)

The correct answer is B. An abstract class CANNOT be instantiated. C. An interface can extend multiple interfaces. E. If concrete class C extends concrete class B, and B implements interface A, then all methods from interface A can be invoked on an instance of C. See the full explanation below for the reasoning.

Question

Which three are true? (Choose three.)

Options

AIf abstract class B directly extends abstract class A, class B must implement all abstract methods declared in A.
BAn abstract class CANNOT be instantiated.
CAn interface can extend multiple interfaces.
DAll methods in an abstract class must be abstract.
EIf concrete class C extends concrete class B, and B implements interface A, then all methods from interface A can be invoked on an instance of C.

How the community answered

(42 responses)

A
7% (3)
B
79% (33)
D
14% (6)

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