Which two descriptions of an OpenFlow meter table are true? (Choose two.)

A.
When one of the 64-bit counters of the meter table is not available in the switch, its value
is set to zero.

B.
When one of the 64-bit counters of the meter table is not available in the switch, its value

is set to 0xffffffffffffffff.

C.
The meter table is used to measure the performance of OpenFlow switch performance.

D.
The meter table is used to implement the QoS features of OpenFlow switches.