What device is being replaced per the bolded documentation

What device is being replaced per the bolded documentation? Procedure: Patient to the cath lab fasting. Left infraclavicular site prepped, draped, and infiltrated with 2% lidocaine. With a #15 scalpel blade a 4 cm horizontal incision was made and S/C dissection to the fibrous pocket surrounding the device. The latter incised and the pacer explanted. The new device was then connected to the appropriate leads. The pocket flushed with an antibiotic solution. The device placed into the pocket and the wound closed with S/C 2-0 Vicryl and subcuticular 3-0 Vicryl. Noninvasive testing showed stable lead impedances. Pace was programmed to the original settings. The patient tolerated the procedure uneventfully. Option A Complete pacemaker replacement Option B Electrodes Option C Battery (Generator) Option D Catheter