What Equipment Function Should Lay Caregivers of Home Mechanical Ventilation

Multiple Choice

What equipment function should lay caregivers of home mechanical ventilation assess regularly?
I.cleanliness and function of bag-valve-mask
II.internal and external battery power levels
III.cleanliness of filters and alarm functions
IV.accuracy of ventilator tidal volume (V_T) output

A) I, II, and III
B) II and IV
C) I, II, III, and IV
D) III and IV