当信息系统受到破坏后，会对社会秩序和公共利益造成严重损害，或者对国家安全造成损害。此信息系统安全保护等级应为（ ）。
- A.二级
- B.三级
- C.四级
- D.五级
正确答案及解析
正确答案
解析
信息系统的安全保护等级共分为五级：
第一级，信息系统受到破坏后，会对公民、法人和其他组织的合法权益造成损害，但不损害国家安全、社会秩序和公共利益。
第二级，信息系统受到破坏后，会对公民、法人和其他组织的合法权益造成严重损害，或者对社会秩序和公共利益造成损害，但不损害国家安全。
第三级，信息系统受到破坏后，会对社会秩序和公共利益造成严重损害，或者对国家安全造成损害。
第四级，信息系统受到破坏后，会对社会秩序和公共利益造成特别严重损害，或者对国家安全造成严重损害。
第五级，信息系统受到破坏后，会对国家安全造成特别严重损害。
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