A client presents with diaphoresis, palpitations, nervousness, and tachycardia approximately 4 hours after taking his usual morning insulin. Which treatment is appropriate for this client?

Check blood glucose level and administer carbohydrates.

Give nitroglycerin and perform an electrocardiogram (ECG).

Check pulse oximetry and administer oxygen therapy.

Restrict salt, administer diuretics, and perform paracentesis.