A system administrator boots a server in normal mode, the boot process displays and LED 551 and stops. LED 551 indicates the root volume group is being varied on. All of the following are probable causes of the problem EXCEPT:（）

A、The bosboot command failed to complete.

B、The JFS log device is corrupted.

C、The initttab file is corrupted.

D、The /dev entries or /etc files are missing.

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  B、血小板数量减少伴巨核细胞成熟障碍

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• 有关系R如下，其中属性B为主键：　　则其中最后一个记录违反了（　　）。

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  C、用户定义的完整性约束

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• A new software engineer has been hired. As part of the normal hiring process, the user was added to the Active Directory and placed into the Domain Users group and the SW_DEV group. The Domain Users group has access to the company's intranet website and time card system. The SW_DEV group has access to the source code library server. You have created roles that correspond to each Active Directory group. The user calls the help desk stating that they cannot access the source code library server. Which two troubleshooting tools would you use on the Junos Pulse Access Control Service to resolve the issue?（）

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