Therootidissetsothatdirectloginisdisabled.Informationmustbereviewedrelatingtowhenrootaccesswasobtained.Inwhichofthefollowingfilesisthisinformationlocated?()

A./var/adm/sulog

B./var/adm/wtmp

C./etc/security/user

D./etc/security/failedlogin