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In CRC if the data unit is $100111001$ and the divisor is $1011$ then what is dividend at the receiver?

1. $100111001101$
2. $100111001011$
3. $100111001$
4. $100111001110$

Given $CRC$ of the data unit is $100111001$ and divisor is $1011$.

Option B is correct.

by

How did you subtracted 1011 from 1001 a ?  1011>1001... and what happened with the carry?

Operation is xor not subtraction.