What is the first stage of the birth process and is the longest and most taxing stage?

Which of the following statements defines basic concepts?

a. They are concepts that have a moderate number of instances and that are easier to acquire than those having few or many instances. b. They are especially representative examples of another concept. c. They are integrated mental networks of knowledge, beliefs, and expectations concerning a particular topic or aspect of the world. d. They are made up of other concepts and express a single idea.

Even if a test is reliable and valid, it should not be used unless it has

a. incremental validity. b. utility. c. a high cutting score. d. content validity.