Identify the option that successfully resolves a comma splice or fused sentence error with structural precision:

Neither the manager nor the employees ___ aware of the schedule change.

Each of the students ___ given a textbook on the first day.

The committee ___ completely divided on the final decision.

Mathematics ___ always been his favorite subject.

A number of critical issues ___ raised during the meeting.

The flock of birds ___ flying directly south for the winter.