When deciding the composition of the engineering watch, which may include appropriately qualified ratings, following criteria shall be taken into account()<br /> Ⅰ.the type of ship<br /> Ⅱ.the type and condition of the machinery<br /> Ⅲ.the safety of life, ship, cargo and port<br /> Ⅳ.the observance of international, national and local regulations
A、Ⅰ+Ⅱ
B、Ⅱ+Ⅲ
C、Ⅱ+Ⅲ+Ⅳ
D、Ⅰ+Ⅱ+Ⅲ+Ⅳ