A 36-year-old man with a history of asthma presents with severe respiratory distress. You attempt to administer a nebulized beta-2 agonist, but his poor respiratory effort is inhibiting effective drug delivery via the nebulizer and his mental status is deteriorating. You should:.a) assist his ventilations and establish vascular access. b) start an IV of normal saline and administer a steroid. c) apply high-flow oxygen via a non-re-breathing mask. d) assist him with a metered-dose inhaler bronchodilator.