In ______, the change or lack of change in the level of the voltage determines the value of the bit.

In ______, the change or lack of change in the level of the voltage de

1.	In ______, the change or lack of change in the level of the voltage determines the value of the bit.
A.	NRZ-I
B.	NRZ-L
C.	both (a) and (b)
D.	neither (a) nor (b)
Answer» B. NRZ-L