Which of the following can act as error detecting devices 1. a pair of potentiometers2. a pair of synchros3. a differential transformer4. a metadyne5. a control transformer Select the answer using the following codes:

Which of the following can act as error detecting devices 1. a pair of

1.	Which of the following can act as error detecting devices 1. a pair of potentiometers2. a pair of synchros3. a differential transformer4. a metadyne5. a control transformer Select the answer using the following codes:
A.	1, 2, 5
B.	2, 3, 4, 5
C.	1, 3, 4, 5
D.	1, 2, 3, 4
Answer» B. 2, 3, 4, 5