Which two Cisco AutoQoS interface statements are true?()
A、AutoQoS is supported on Frame Relay multipoint subinterfaces.
B、AutoQoS is supported on low-speed ATM PVCs in point-to-point subinterfaces.
C、AutoQoS is supported on serial PPP and HDLC interfaces.
D、AutoQoS is supported only on Frame Relay main interfaces and not on any subinterface configuration.