Select the Correct Statement Related to the Bronchodilators Salmeterol and Formoterol

Select the correct statement related to the bronchodilators salmeterol and formoterol.

A) Salmeterol and formoterol are administered as oral tablets, have an immediate onset of action, and have a duration of action of 12 hours.
B) Salmeterol and formoterol are administered by nebulization, have an immediate onset of action, and have a duration of action of 4 to 6 hours.
C) Salmeterol and formoterol are administered by inhalation, have an onset of action of 10 to 20 minutes, and have a duration of action of 12 hours.
D) None of these are correct.