Choose the correct pairing of characteristic brain waves with their stages of sleep:
a) Stage N1 || Beta Waves; Stage N2 || Alpha Waves; Stage N3 || Delta Waves; Stage W || Theta Waves
b) Stage W || Beta Waves; Stage N1 || Alpha Waves; Stage N2 || Theta Waves; Stage N3 || Delta Waves
c) Stage W || Alpha Waves; Stage N1 || Beta Waves; Stage N2 || Theta Waves; Stage N3 || Delta Waves
d) Stage N3 || Theta Waves; Stage N2 || Delta Waves; Stage N1 || Beta Waves; Stage W || Alpha Waves