Whhich statement is true abou the difference between voice VLAN and native VLAN?

A.
Voice VLAN uses untagged frames whereas native VLAN uses 802.1Q frames

B.
Voice VLAN uses tagged 802.1Q frames whereas native VLAN uses 802.1P frames

C.
Voice VLAN uses tagged 802.1Q frames whereas native VLAN uses untagged frames

D.
Voice VLAN uses untagged frames only when no PCs are connected behind the phones whereas native VLAN always uses untagged frames