Two routers, R$1$ and R$2,$ connect using an Ethernet over MPLS service. The service provides point$-$to$-$point

service between these two routers only, as a Layer $2$ Ethernet service. Which of the following are the most likely

to be true about this WAN? $($Select all that apply.$)$

R$1$ will connect to a physical Ethernet link, with the other end of the cable connected to R$2.$

R$1$ will connect to a physical Ethernet link, with the other end of the cable connected to a device at the WAN service

provider point of presence.

R$1$ will forward data$-$link frames to R$2$ using an HDLC header$/$trailer$.$

R$1$ will forward data$-$link frames to R$2$ using an Ethernet header$/$trailer$.$