What directory service protocol which Active Directory is based on$,$ is used by Linux Oss $($Operating Systems$)?$ This protocol has the advantage of supporting both Windows and Linux user authentication and authorization.a$.$NCP $($Network Control Protocol$)$b$.$NIS $($Network Information Service$)$c$.$LDAP $($Lightweight Directory Access Protocol$)$d$.$ICMP $($Internet Control Message Protocol$)$