The Bell-LaPadula Model divides a system into subjects and objects

Suppose A is an interface, B is a concrete class with a no-arg constructor that implements A. 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();

Every customer has a customer number, arrival time, waiting time, transaction time, and departure time.

Answer the following statement true (T) or false (F)