Misuse of "which" and "witch" is flagged as a(n) ________ error

The function F provides the element of __________ in a Feistel cipher. ?

A) ?clarification B) ?alignment ? C) ?confusion D) ?stability

Computing and other electrical equipment used in areas where water can accumulate must be uniquely grounded using __________ equipment.

A. UPS B. HVAC C. GFCI D. ESD