The best known example of a MAN is:
(A) Ethernet (B) Cable Television
(C) FDDI (D) IEEE 802.3
i think answer should be option b) cabel television
see here : http://www.conceptdraw.com/diagram/cable-television-network-is-example-of-man-network
IEEE 802.6 standard is used for MAN , so option d is wrong .
ethernet is used in LAN so option A is also wrong
some implementations deployed FDDI as a metropolitan area network.but since best known example is asked so option b should be answer