PLEASE ANSWER FAST, WILL GIVE BRAINLIEST AND 20 POINTS What causes the poles of the electromagnet in an audio speaker to repeatedly switch directions?

A. a metal striker that pulls on the magnet
B. a diaphragm that vibrates around the magnet
C. a current that rapidly switches direction
D. a device that opens and closes a circuit

Who needs to approve a change before it is initiated? (select two.) -change board -client or end user -ceo -personnel manager -project manager

Which of the following statements is false? a. a class can directly inherit from class object. b. if the class you're inheriting from declares instance variables as private, the inherited class can access those instance variables directly. c. a class's instance variables are normally declared private to enforce good software engineering. d. it's often much more efficient to create a class by inheriting from a similar class than to create the class by writing every line of code the new class requires.

Companies that implement and apply an information system effectively can create