Which two statements about single$-$area and multiarea OSPF are true? $($Choose two.$)$

Single$-$area OSPF has one advantage over multiarea OSPF: smaller routing tables.

When a multiarea design is used, one of the areas should be Area $0.$

In multiarea OSPF, Area $1$ must be physically connected to the backbone, and all other areas must be connected to Area $1.$

Multiarea OSPF is more scalable than single$-$area OSPF and is easier to implement.

In single$-$area OSPF, all routers inject routing information into the backbone router, and in turn the backbone router sends that information to other routers.