Refer to the exhibit. A customer indicates their teleworkers plan to use IP phones in their home offices. The IT department has surveyed the planned teleworkers, resulting in the user groupings shown in the exhibit. To provide the highest voice quality, the best recommendations to this customer are（）.
- ADeploy all three groups with a QoS service policy, choosing the parameters for Traffic Shaping based on the average uplink speed across the three groups.
- BTeleworkers in Groups A and B should inquire with their DSL providers for subscriptions with higher uplink bandwidths.
- CTeleworkers in Group C should change their subscriptions to DSL for deployment consistency.
- DTeleworkers in Group A should upgrade their subscription to obtain static IP addresses
- ETeleworkers in Group A should inquire with their DSL providers for subscriptions with higher downlink bandwidths.