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Based on the guidelines listed in the nursing care plan, the LPN/LVN teaches a patient who has recently had a modified radical mastectomy. The LPN/LVN recognizes it is important for the patient to exercise her arm postoperatively for which of the following reasons?
1. Increase muscle strength and diameter.
2. Maintain body balance.
3. Limit full range of motion.
4. Prevent lymphedema.