Cable modems are a popular Internet access technology that lets cable companies use existing broadband cable infrastructures to provide two$-$way Internet access to customers. Since such systems use Ethernet II frames, this protocol is sometimes called what?

a$.$ High$-$Level Data Link Control

b$.$ Point$-$to$-$Point Protocol $($PPP$)$

c$.$ Point$-$to$-$Point Protocol over Ethernet $($PPPoE$)$

d$.$ Synchronous Data Link Control