Which of the following regarding DNA gyrase in E.Coli is correct?

A)It works to remove negative supercoiling introduced by the DnaB protein (helicase).
B)It is a topoisomerase that hydrolyzes ATP during its reaction mechanism.
C)Its mechanism involves the breaking of a single phosphoester bond in 1 strand of dsDNA.
D)It works to introduce positive supercoiling in DNA to overcome the torsion stress imposed upon unwinding.