Which of the following devices is normally bidirectional? A) ...

[pepyto]

Which of the following devices is normally bidirectional?
 
  A) monitor B) keyboard C) disk drive D) printer

Question 2

Polling ________.
 
  A) is more efficient than interrupt-driven processor operation
  B) has the processor operate normally until a device signals that it requires servicing
  C) requires the processor to periodically check each device to see which if any of them require servicing
  D) none of the above

[janeli1]

Answer to Question 1

C

Answer to Question 2

C