A client's severe asthma has necessitated the use of a long-acting beta2-agonist (LABA). Which of the client's statements suggests a need for further education?

make sure to use this each time I feel an asthma attack coming on."

"I know that these drugs can sometimes make my heart beat faster."

"I've heard that this drug sometimes gets less effective over time."

"I've heard that this drug is particularly good at preventing asthma attacks during exercise."