Life boat should have

A. 2 buoyant rescue quoits attached not less than 30m buoyant line
B. 2 buoyant rescue quoits attached not less than 15m buoyant line
C. 1 buoyant rescue quoits attached not less than 30m buoyant line
D. 1 buoyant rescue quoits attached not less than 15m buoyant line