The Patient Is Scheduled to Have a Permanent Pacemaker Implanted

The patient is scheduled to have a permanent pacemaker implanted.The patient asks the nurse,"How long will the battery in this thing last?" The nurse should solve,

A) "Life expectancy is about 1 year.Then it will need to be replaced."
B) "Pacemaker batteries can last up to 25 years with constant use."
C) "Battery life varies depending on usage, but it can last up to 10 years."
D) "Pacemakers are used to treat temporary problems, so the batteries don't last long."