Choice "D" is correct. All of the statements are correct. User accounts are the first target of a hacker who has gained access to an organization's network. Consequently, it is important to have procedures in place to monitor and address position changes, to maintain a strong coordination between Human Resources and Information Technology departments, and to have a method to consistently disable accounts once an employee is terminated.Choice "a" is incorrect. Choice "D" is the best answer since items "b" and "c" are also correct.Choice "b" is incorrect. Choice "D" is the best answer since items "a" and "c" are also correct.Choice "c" is incorrect. Choice "D" is the best answer since items "a" and "b" are also correct.