Which series of keys do you press on a Cisco 7975 phone to unlock the network settings on an IP phone?

Which series of keys do you press on a Cisco 7975 phone to unlock the network settings on an IP
phone?

A.
Select the settings button and then select press ##

B.
elect the settings button and then press *#*

C.
Select the settings button and then select *#

D.
Select the settings button and then press **#