Final answer:
The police sergeant has committed sexual assault, police misconduct, and violation of professional ethics.
Step-by-step explanation:
The police sergeant has committed All of the above. Sexual assault refers to any non-consensual sexual contact, while police misconduct refers to any illegal or inappropriate actions by police officers. Violation of professional ethics refers to any breach of ethical standards expected of professionals in a specific field, such as law enforcement. In this case, the police sergeant has engaged in sexual assault, which is a form of police misconduct, and it also violates professional ethics.