A Patient's Status Worsens and Needs Mechanical Ventilation

A patient's status worsens and needs mechanical ventilation.The pulmonologist wants the patient to receive 10 breaths/min from the ventilator but wants to encourage the patient to breathe spontaneously in between the mechanical breaths at his own tidal volume.This mode of ventilation is called:

A) assist/control ventilation
B) controlled ventilation
C) intermittent mandatory ventilation
D) positive end-expiratory pressure