【单选题】S1:What's the security level at this port now?S2:Security level 1.S1:Then what should be done to prevent unauthorized persons from boarding the ship?S2:All access points have to be monitored continuou...
A.
Have only one access points monitored.
B.
Have all access points secured and locked.
C.
Have all access points monitored all the time.
D.
Have all access points monitored for 2 hours in the daytime.