Which of the following statements regarding abstract classes is true? A data field can be declared abstract. An abstract class cannot be extended. A class that contains abstract methods must be abstract. One cannot create an array of an abstract class. Moving to another question will save this response. Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have default no-argument constructions abstract class A () class B extends A () Which of the following is correct? O A a = new A0: O A a = new B0: Bb = new A0: Ba = new A0); A Moving to another question will save this response.