单选题通过船舶保安评估，应确定并评估的影响船舶保安的基本要素包括（）。Ⅰ．现有保安措施、程序和操作的有效性；Ⅱ．应予重点保护的船上关键操作；Ⅲ．船上关键操作可能受到的威胁及其发生的可能性；Ⅳ．公司保安计划的薄弱点。AⅡ～ⅣBⅠ～ⅢCⅠ～ⅣDⅠ、Ⅱ、Ⅳ
单选题
通过船舶保安评估，应确定并评估的影响船舶保安的基本要素包括（）。Ⅰ．现有保安措施、程序和操作的有效性；Ⅱ．应予重点保护的船上关键操作；Ⅲ．船上关键操作可能受到的威胁及其发生的可能性；Ⅳ．公司保安计划的薄弱点。
A
Ⅱ～Ⅳ
B
Ⅰ～Ⅲ
C
Ⅰ～Ⅳ
D
Ⅰ、Ⅱ、Ⅳ
参考解析
解析：
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