Final answer:
The nurse should take the client's apical pulse rate before administering Lanoxin.
Step-by-step explanation:
The nurse should implement option b. Take the client's apical pulse rate before administering the medication. Lanoxin, also known as Digoxin, is a medication commonly used to treat heart failure. It works by helping the heart to beat more effectively. One of the potential side effects of Lanoxin is an irregular heart rate, so it is important to check the client's pulse rate before administering the medication to ensure that it is within the appropriate range.