What is tidal volume? Find out the tidal volume (approximate value) for a healthy human in an hour.

a) Tidal volume is the volume of air inspired or expired during normal breathing.
b) Tidal volume is the volume of air inspired or expired during deep breathing.
c) Tidal volume is the volume of air inspired or expired during forced breathing.
d) Tidal volume is the volume of air inspired or expired during sleep.