问题：

[单选] Rate your level of proficiency with managing and maintaining a server environment, including monitoringsystem and server performance, managing Web servers, monitoring and analyzing events, managing softwareupdates and site licenses, monitoring file and print servers, and managing servers remotely. （）

A . I am considered an expert on this. I have successfully done this multiple times without assistance or error. I train or supervise others on this activity. Others come to me when they have questions or need assistance with this.
B . I have successfully done this without assistance and with few errors, but I do not train or supervise others on this activity.
C . I am proficient at this. I have successfully done this on my own, but I occasionally require assistance for some types of problems encountered when doing this and/or occasionally make minor errors.
D . I have successfully done this with the assistance of others or specific instructions.
E . I am a novice. I have not done this yet or I am learning.