What Equipment Function Should Lay Caregivers of Home Mechanical Ventilation

Multiple Choice

What equipment function should lay caregivers of home mechanical ventilation assess regularly?
1) Cleanliness and function of bag-valve-mask
2) Internal and external battery power levels
3) Cleanliness of filters and alarm functions
4) Accuracy of ventilator tidal volume (V_T) output

A) 1, 2, and 3 only
B) 2 and 4 only
C) 1, 2, 3, and 4
D) 3 and 4 only