Which of the Following Devices Are Most Commonly Used to Deliver

Which of the following devices are most commonly used to deliver aerosols by the inhalation route?
1) Small particle aerosol generator
2) Metered dose inhaler
3) Small volume nebulizer
4) Soft-mist inhaler

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