Which one of the following are the correct stages (1 to 4) of sleep? A. Small, irregular waves which includes alpha waves; sleep spindles; appearance of delta waves; mostly slow-wave delta. B. Sleep...

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Extracted text: Which one of the following are the correct stages (1 to 4) of sleep? A. Small, irregular waves which includes alpha waves; sleep spindles; appearance of delta waves; mostly slow-wave delta. B. Sleep spindles; small, irregular waves which includes alpha waves; appearance of delta waves; mostly slow-wave delta. C. Appearance of delta waves; mostly slow-wave delta; small, irregular waves which includes alpha waves; sleep spindles. D. Mostly slow-wave delta; sleep spindles; small, irregular waves which includes alpha waves; appearance of delta waves.