What are the advantages and limitations of long-term asthma controllers?

Corticosteroids reduce exacerbations, improve lung function, reduce airway reactivity, and reduce airway inflammation.
Leukotriene antagonists reduce symptoms, improve lung function, reduce exercise-induced bronchospasm, and prevent allergen-induced inflammation.
Long-acting β2-agonists reduce exacerbations, improve lung function, reduce airway hyperreactivity, and attenuate exercise-induced bronchospasm.
Long-term use of corticosteroids has a significant risk of adverse effects, such as growth suppression, adrenal suppression, osteoporosis, fractures, cataracts, and glaucoma, weight gain, and hypertension.
a) I and II are correct.
b) II and III are correct.
c) I, II, and III are correct.
d) III and IV are correct.