What Is Meant by "Tidal Ventilation

What is meant by "tidal ventilation"?

A) Air moves into the lungs during inhalation and air moves out of the lungs during exhalation.
B) Air moves in a continuous, unidirectional flow through the lungs.
C) Water is pumped back and forth across the respiratory system.
D) The ventilation rate increases and decreases at regular intervals.
E) None of the answer options is correct.