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________ uses two means to authenticate the user, such as biometrics or a smart card used in combination with a password.

a) Two-method authentication. b) Digital authentication. c) Two-factor authentication. d) None of the above.

Which of the following statements is true?

a. Using existing exceptions makes the program less robust. b. Always create your own exception classes. c. An exception class is like any other class; however, a typical new exception class contains no members other than four constructors. d. The new exception class should extend RuntimeException if the program should be required to handle the exception.