143. Which of the following statements describes the purpose of the split inflatable seal installed aft of the primary seal assembly for the propeller shaft?

A. To serve as a seal when adding packing to the stuffing box.
B. To allow repair or replacement of the primary seal elements when the ship is waterborne.
C. To eliminate leakage via the propeller shaft when the shaft is not rotating.
D. To provide a ready means for the entry of cooling water.