Which option would you use to exit the Cisco Nexus Operating System interface configuration
mode and return to the exec prompt?

A.
nexus(config-if)#Ctrl-C
nexus#

B.
nexus(config-if)#Ctrl-Z
nexus#

C.
nexus(config-if)#Ctrl-E
nexus#

D.
nexus(config-if)#exit
nexus#

Explanation:
“Ctrl-Z Ends a configuration session, and returns you to EXEC mode.
When used at the end of a command line in which a valid command has been typed, the resulting
configuration is first added to the running configuration file.”
http://www.cisco.com/en/US/docs/switches/datacenter/sw/4_1/nxos/fundamentals/configuration/guide/Cisco_Nexus_7000_Series_NXOS_Fundamentals_Configuration_Guide__Release_4.1_chapter4.html
PS. “exit” return to global config only