What is the -k option for of the Ping utility in OS X?

Hi,
May I know what is the -k option for of the Ping utility in OS X? It doesn't seem to be a ICMP protocol standards-relates.
Below is the description of this option copied from Yosemite.
-k trafficlass
             Specifies the traffic class to use for sending ICMP packets. The
             supported traffic classes are BK_SYS, BK, BE, RD, OAM, AV, RV,
             VI, VO and CTL. By default ping uses the control traffic class
             (CTL).
Thank you!

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What is the -k option for of the Ping utility in OS X?

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