After an audit, an administrator discovers all users have access to confidential data on a file

server. Which of the following should the administrator use to restrict access to the data

quickly?

A$.$ Group Policy

B$.$ Content filtering

C$.$ Data loss prevention

D$.$ Access control lists

Answer is D$,$ but i think answer will be A as it is mentioned in question that admin should restrict access of many users immediately. So if he uses group policy, he can restrict immediately but if he uses acl, it will take lot of time. What is the correct answer?