Which statements regarding MPLS $($Multiprotocol Label Switching$)$ are TRUE?

Select one or more:

a$.$ One of the benefits of MPLS is that MPLS connections are highly scalable.

b$.$ Collectively, the MPLS labels are sometimes called a fragment because of their placement between Layer $3$ and Layer $2$ information.

c$.$ MPLS enables multiple types of Layer $3$ protocols to travel over any one of several connection$-$oriented Layer $2$ protocols.

d$.$ MPLS offers potentially faster transmission than traditionally routed networks.