________ is a process where the delete query will remove data that is not useful or needed anymore

Polymorphism is implemented via:

a. Member functions. b. virtual functions and dynamic binding. c. inline functions. d. Non-virtual functions.

Which of the following assignments would be a compilation error?

a. Assigning the address of a base-class object to a base-class pointer. b. Assigning the address of a base-class object to a derived-class pointer. c. Assigning the address of a derived-class object to a base-class pointer. d. Assigning the address of a derived-class object to a derived-class pointer.