Which of the following chart types is used to show data that changes over time?

By default JScrollPane ________.

a. always displays scrollbars b. never displays scrollbars c. only displays scrollbars if they are needed d. None of the above

With just facts and goals, Prolog would be nothing more than a database, but the addition of _________ gives programmers a set of tools to manipulate the facts.?

Fill in the blank(s) with the appropriate word(s).