When a router converts analog signals to digital signals， what three steps are always included in the process？（）

A.provide visibility into the classes of service deployed using system logging and SNMP traps
B.determine WAN settings for fragmentation， compression， encapsulation， and Frame Relay-ATM interworking
C.enable the AutoQoS VoIP for voice traffic
D.generate and deploy MQC-based QoS policies
E.profile the traffic with Auto-Discovery

A.large files are being downloaded over the WAN network
B.IP phone traffic is not being classified correctly
C.more bandwidth is required for the office LAN
D.Call Admission Control has not been implemented 
E.employees are watching videos over the internet
F.header compression is not being used

A.business-critical traffic includes VoIP and voice signaling packets
B.SDM can be used to configure a basic QoS policy for incoming traffic on WAN interfaces andIPsec tunnels
C.SDM can provide QoS for real-time traffic and business-critical traffic
D.SDM creates a custom-queuing （CQ） or a priority-queuing （PQ） policy
E.SDM creates a low latency queuing （LLQ） service policy with its associated classes
F.when allocating bandwidth， values can be entered in either bandwidth percentage or kilobytes per second （kBps）