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To send same bit sequence, $\text{NRZ}$ encoding require

1. Same clock frequency as Manchester encoding
2. Half the clock frequency as Manchester encoding
3. Twice the clock frequency as Manchester encoding
4. A clock frequency which depend on number of zeroes and ones in the bit sequence

In Manchester encoding scheme , there is a transition after every bit. It means that we must have clocks with double the speed to send same amount of data as in NRZ encodings please refer to https://www.cse.iitk.ac.in/users/dheeraj/cs425/lec03.html

option B where NRZ encoding require Half the clock frequency as Manchester encoding  for the same value bit representations of voltages changes .

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