Web pages are unstructured documents in which elements are nested within other elements,forming a hierarchy of elements.

To get a help using various Access commands, you should use the ________ window

Fill in the blank(s) with correct word

Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have a no-arg constructor. Which of the following is correct?

a. A a = new A(); b. A a = new B(); c. B b = new A(); d. B b = new B();