A company is reviewing measures to enhance the security of its server room, which is located in a building shared with other tenants. Recent security audits suggest the need for better controls to prevent unauthorized physical access. Which of the following options would best enhance the security of the server room?
Implementing a combination lock with a shared code for all IT staff members
Maintaining a manual log book for employees to sign in and out when accessing the server room
Requiring IT staff to be present at the entrance of the server room at all times
Installing biometric access controls on the entrance to the server room