Which Cisco IOS traffic-shaping mechanism statement is true？ （）
- Aclass-based policing is configured using the Modular QoS command-line （MQC）
- Bonly the Frame Relay traffic-shaping （FRTS） mechanism can interact with a Frame Relay network， adapting to indications of Layer2 congestion in the WAN links
- CDistributed Traffic Shaping （DTS） is configured with the police command under the policy map configuration
- Dboth Frame Relay traffic shaping （FRTS） and virtual IP （VIP）-based Distributed Traffic Shaping （DTS） have the ability to mark traffic