A denial-of-service attack is considered which of the following?

Repetition in which the number of iterations is unknown before the loop begins executing is called ________.

a) indefinite repetition b) controlled repetition c) top-down repetition d) None of the above.

The preferred means of creating multithreaded Java applications is by implementing the ________ interface. An object of a class that implements this interface represents a task to perform.

a. Thread b. Runner c. Runnable d. None of the above.