Which two statements about QoS options in a Cisco UCS environment are true?

Which two statements about QoS options in a Cisco UCS environment are true? (Choose two.)
A. The QoS policy assigns a system class to the outgoing traffic for a vNIC or vHBA.
B. Flow-control policies determine whether the uplink Ethernet ports in a Cisco UCS environment send and receive IEEE 802.3x pause frames when the send buffer for a port fills.
C. If no system class is configured as CoS 0, the Fibre Channel system class is used.
D. The user can configure QoS for these system classes: platinum, gold, silver, best effort, Fibre Channel.
E. When configuring a system class, the type of adapter in a server may limit the maximum MTU supported.

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