Refer to the exhibit.

module ex-ethernet ( namespace "http://example.com/ethernet"; prefix "eth"; import ietf-intertaces { prefix if; } augnent "/if:interfaces/if:interface" { when "if:type = 'ethernetCsmacd'"; container ethernet { must "../if:1ocation" { description "An ethernet interface must specify the physical location of the ethernet hardware."; } choice transmission-parans { case auto { leaf auto-negotiate { type empty: } } case manual { leaf duplex { type enumeration { enum "half"; enum "half"; } } leaf speed { type enumeration { enum "10Mb" enum "100Mb" enum "1Gb" enum "10Gb" } } } } // other ethernet specific params... } }

What is represented in this YANG module?

A.	interface management
B.	BGP
C.	OpenFlow
D.	topology