Which statement is characteristic of Unified Communications (UC) in legacy networks?
A. UC is challenging to deploy on legacy networks due to traffic engineering and Quality of Service (QoS) needs.
B. UC management on legacy networks is handled through a dedicated management application.
C. UC has become easier to deploy on legacy networks because of the increasing number of employees who use their own devices.
D. UC can be effectively deployed on legacy networks with software-defined networking (SDN).