Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: In a patient connected to invasive mechanical ventilation, when all movements are generated by the ventilator, supplying a certain volume with a constant flow during a preset time, without allowing the synchronization with spontaneous or additional respirations of the patient, we refer to: 
 Options:  <1> Assisted ventilation <2> Controlled mechanical ventilation. <3> Synchronized intermittent mandatory ventilation. <4> Spontaneous ventilation with continuous positive pressure. <5> Positive pressure at the end of expiration.
