Q. I would like to ask about negation. If I would like to say “Neither A, B, nor C is D,” is it also grammatically correct to write “A, B, and C are not D”?
A. Both are grammatically correct (though sticklers may insist that either-or and neither-nor can be used only with pairs), but the second version is slightly ambiguous, since it may be taken to mean either “A is not D; B is not D; and C is not D” or “A + B + C does not equal D.” It’s good to remember that even nonsense can be grammatically correct.