Which statement is not correct?

a. Persistence by marking implies that all objects will be created as persistent. An object can then be marked as transient at compile time.

b. Persistence by class implies that all objects of a particular class will be made persistent.

c. Persistence by creation is achieved by extending the syntax for creating objects to indicate at compile time that an object should be made persistent.

d. Persistence by inheritance indicates that the persistence capabilities are inherited from a predefined persistent class.