Which three are true? (Choose three.)
A.
All methods in an abstract class must be abstract.
B.
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.
An abstract class CANNOT be instantiated.
D.
If abstract class B directly extends abstract class A, class B must implement all abstract
methods declared in A.
E.
An interface can extend multiple interfaces.