A client is concerned about the risk of lymphedema after a mastectomy. Which response by the nurse is best?

"Numbness, tingling, and swelling are common sensations after a mastectomy."

"You do not need to worry about lymphedema since you did not have radiation therapy."

"The risk for lymphedema is a real threat and can be very self-limiting."

"Be careful not to injure that arm or get any infection in that arm."