A Technician Needs to Implement a System Which Will Properly

A technician needs to implement a system which will properly authenticate users by their username and password only when the users are logging in from a computer in the office building. Any attempt to authenticate from a location other than the office building should be rejected. Which of the following MUST the technician implement?

A) Dual factor authentication
B) Transitive authentication
C) Single factor authentication
D) Biometric authentication