In a novel routing algorithm, a router has several available interfaces to forward a packet. Will it choose the interface with the "least cost" or "lowest cost" to forward the packet?
Not sure why this got downvoted, with no answers or comments.
This is kind of a tough one. I'm not sure what the actual grammatical rules (i.e. what's correct and what isn't) regarding this. I do know that both terms are quite common. Terms that describe mathematics always use "least" (such as "least common denominator"). I believe that "least" is the most proper, but if you said "lowest" in colloquial conversation I don't think anyone would care.