In this factory the machines are not regulated ______ but are jointly controlled by a central computer system.

A:independently B:individually C:irrespectively D:irregularly

These machines are not regulated ______ but are jointly controlled by a central computer system.

A:inevitably B:individually C:irrespectively D:irregularly

These machines are not regulated ______ but are jointly controlled by a central computer system.

A:inevitably B:individually C:irrespectively D:irregularly