Which protocol is responsible for the discovery of FCoE capabilities on a remote switch?

Which protocol is responsible for the discovery of FCoE capabilities on a remote switch?
A . DCE
B . DCBx
C . CDP
D . LLDP

Answer: B

Explanation:

Data Center Bridging Capabilities Exchange Protocol (DCBX): a discovery and capability exchange protocol that is used for conveying capabilities and configuration of the above features between neighbors to ensure consistent configuration across the network. This protocol leverages functionality provided by IEEE 802.1AB (LLDP). It is actually included in the 802.1az standard.

Reference: http://en.wikipedia.org/wiki/Data_center_bridging