The #FIXED attribute default is used to indicate that the use of an attribute is optional.

When a subclass constructor calls its superclass constructor, what happens if the superclass’s constructor does not assign a value to an instance variable?

a. A syntax error occurs. b. A compile-time error occurs. c. A run-time error occurs. d. The program compiles and runs because the instance variables are initialized to their default values.

Door access to an organization’s server room is being scheduled. Which of the following are best practices for door access control? (Select all that apply.)

a. Require a proximity reader. b. Require multiple keys. c. Use biometrics. d. Require key fobs. e. All of the above.