Which of the following statements is not correct?

a$.$ Objects are blueprints of classes. $$Human$,$Employee$,$ and

$$Sale$$ are examples of objects.

b$.$ Objects are instances of classes. The people $$Bart Baesens$,$

$$Wilfried Lemahieu$,$ and $$Seppe vanden Broucke$$ could be

instances of the class $$Person$.$

c$.$ Objects store both a piece of information and ways to

manipulate this information.

d$.$ A class can be instantiated into several objects.