A class that implements an interface but only gives definitions for some of the method headings given in the interface is called a/an:

Which of the following statements is true?

a. When you drive a car, pressing its gas pedal sends a message to the car to perform a task—that is, to go faster. b. You send messages to an object; each message is implemented as a method call that tells a method of the object to perform its task. c. A program might call a bank-account object’s deposit method to increase the account’s balance. d. All of the above statements are true.

Which of the following keyboard shortcut keys can you press to insert a line break in a text box?

A. CTRL+ENTER B. ALT+ENTER C. TAB+ENTER D. SHIFT+ENTER