Which two statements regarding Integrated IS$-$IS versus OSPF area design are true? $($Choose two.$)$

In OSPF, the border is inside routers $($ABRs$),$ and each link belongs to one area.

In IS$-$IS$,$ the border is inside routers $($L$1$L$2),$ and each link belongs to one area.

In OSPF, the area borders lie on links, and each OSPF router belongs to exactly one area.

In IS$-$IS$,$ the area borders lie on links, and each IS$-$IS router belongs to exactly one area.