When controlled from more than one location by either a pair of 2-position 3-way switches or a combination of 3-way/4-way switching, the switches must be wired in ____________ with each other in the __________________ side of the branch-circuit supply ahead of the ____________ lighting load.
A) parallel; grounded; parallel
B) parallel; ungrounded; parallel
C) series; grounded; series
D) series; ungrounded; parallel
Share your understanding of this question with the correct explanation.