Ensures that the individual is who they claim to be (the authentic or genuine person) and not an imposter.
encryption
authentication
authorization
accounting

Authentication ensures that the individual is who they claim to be (the authentic or genuine person) and not an imposter.

Iwould go with either b or c, not sure which one.

That i would call a dead end, since you can't know that it's always possible to immediately reconnect (server could be down, lines between you and the server could be down), and even if it was this would take some time slipping the packages out your wan in the meantime.the solution to this problem rather like satras says to block wan access for those hosts, and if policy routing is being used you need to use the soltion found by fastlanejb in this thread:   the link to the problem forum