In order to communicate the threat at a port facility or for a ship, the Contracting Government will set the appropriate security levels Security level 1 corresponds to（）

A.a ship security plan
B.a ship security officer
C.a company security officer
D.certain onboard equipments

A.the detailed security-related requirements
B.guidelines to meet security-related requirements
C.the detailed security-related requirements and the guidelines to meet them
D.how to run a shipping company considering the potential terrorism action

A.to protect the marine environment
B.to provide a method to avoid an accident
C.to protect the ship from collision
D.to keep terrorism action away from ships