What are the four categories of linear implementations of tables?

The _________ allows multiple threads to have simultaneous read-only access to an object protected by the lock.

A) ?barrier ? B) ?condition variable C) ?readers/writer lock ? D) ?mutex

Why is the efficiency of algorithms desirable?

A. an inefficient algorithm may use too much time or space B. efficient algorithms always cost less money C. inefficient algorithms always use too much memory D. efficient algorithms always use less memory