In which waveform logic 1 is represented by half bit wide pulse and logic 0 is represented by absence of pulse?

In which waveform logic 1 is represented by half bit wide pulse and l

1.	In which waveform logic 1 is represented by half bit wide pulse and logic 0 is represented by absence of pulse?
A.	unipolar rz
B.	bipolar rz
C.	rz-ami
D.	manchester coding
Answer» B. bipolar rz