A shipboard oil pollution emergency plan is required of

 A shipboard oil pollution emergency plan is required of

1)  all vessels regardless of size and commercial application 
2) any barge or ship constructed or operated in such a manner that no oil in any form be carried aboard
3) an oil tanker of 150 gross tons and above or other ship of 400 gross tons and above 
4) an oil tank of 150 gross tons and above or other ship of  400 gross tons and above

Ans____4) an oil tank of 150 gross tons and above or other ship of  400 gross tons and above