If you create an empty method within an abstract class, the method is abstract even if you do not explicitly use the keyword abstract.

COGNITIVE ASSESSMENT To what does the term, traffic, refer to when used in conjunction with the Internet?

A. the number of computers on the Internet B. the communications activity on the Internet C. all the wired, wireless, and satellite connections on the Internet D. the wires, fiber optics, underground cables, and radio signals used to carry the data and information across the Internet

A surprising number of problems fall into the "____" category.

A. suspected intractable B. approximation algorithm C. bin-packing D. declared intractable