List and describe each of the stages and planes of anesthesia.
a) Stages: Induction, maintenance, recovery; Planes: Light, moderate, deep, surgical.
b) Stages: Pre-induction, induction, maintenance, recovery; Planes: Alpha, beta, gamma.
c) Stages: Awake, sedated, anesthetized, awake; Planes: Upper, lower, middle.
d) Stages: Pre-op, intra-op, post-op; Planes: Conscious, semi-conscious, unconscious.