All of the following are characteristic of replication of the E. coli circular chromosome EXCEPT:

A) replication is bi-directional.
B) it initiates at a unique position called oriC.
C) torsional stress introduced in the duplex DNA is relieved by DNA gyrase.
D) the unwinding of the duplex DNA is driven by the translocation of the DNA polymerase.
E) replication forks move in opposite directions.