Collision rules（）apply to all vessels upon the high seas.

A.has less strength than manila line
B.has more strength than manila line
C.is equivalent to manila line
D.will rot quicker than manila line

A.never leak but may be spoiled by leakage
B.sometimes leak and damage themselves
C.often leak and damage other cargo
D.neither leak nor will be damaged by leakage

A.the call sign and name
B.the official number and name
C.the port of registry and name
D.the port of registry and official number