Which two statement about voice VLANs are true? (Choose two)

Which two statement about voice VLANs are true? (Choose two)
A . They require PortFast to be enabled manually on the interface
B . They support static source MAC address
C . When they are enabled, all Cos values in incoming traffic are untrusted
D . When they are enabled, all untagged traffic is assigned a CoS of 5
E . They are disabled by default
F . The VLAN number must be in the range 2000 through 4096

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Answer: DE