$27.$ Which statements regarding the two protocols integral to PPP $($Point$-$to$-$Point Protocol$)-$ LCP $($Link Control Protocol$)$ and NCP $($Network Control Protocol$)$ are INCORRECT $($More than one statement applies$)?$a$.$NCP sets up the PPP connection.b$.$NCP works only at the Data Link layer of the OSI $($Open Systems Interconnection$)$ model.c$.$LCP provides dynamic IP $($Internet Protocol$)$ addressing.d$.$LCP defines communication parameters and authentication protocols.