A client diagnosed with allergic rhinitis is prescribed an antihistamine to assist with symptoms. Which of the following medications below would be considered a second-generation antihistamine?

A. Chlorpheniramine is a first-generation antihistamine and may cause sedation and other side effects due to its ability to cross the blood-brain barrier. B. Cetirizine is a second-generation antihistamine that is less likely to cause sedation and is used to relieve symptoms of allergic rhinitis. C. Montelukast is a leukotriene receptor antagonist, not an antihistamine, and is used for allergic rhinitis and asthma. D. Diphenhydramine is a first-generation antihistamine known for its sedative effects and is often used for allergies but is not classified as a second-generation antihistamine.