A key element of Internet$2$ is

Select one:

a$.$ the requirement that all users log on to each site with a unique password.

b$.$ the very$-$high$-$speed backbone network service $($vBNS$).$

c$.$ a new security system that eliminates the risk that unauthorized users will be able to access private information.

d$.$ the high$-$speed resource allocation prioritizer $($hsRAP$).$