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3. An event handler is ___.

A. something that happens, such as mouse clicks, keystrokes, and touches (for touch enabled devices), while a program is running and interrupts the program’s flow B. an object that listens for events, such as mouse, keyboard, and touch events C. a function that will be executed when the event occurs

Non-abstract classes are called ________.

a. real classes. b. instance classes. c. implementable classes. d. concrete classes.