Question: In the treatment of asthma can be used on demand: 
 Options:  <1> Inhaled glucocorticoids at low doses. <2> Long-acting inhaled beta-2 adrenergic agonist. <3> Short-acting inhaled beta-2 adrenergic agonist. <4> Inhaled anticholinergics. <5> Inhaled disodium cromoglycate.
3