could play a role as a primary domain controller (PDC) and backup domain controller (BDC), independent server, please briefly describe the role of the three functions, then judge should choose the server's role.

Filename	Size	Update
图片
....\20031020190827.jpg
....\20031103115116.jpg
....\5723133.jpg
....\b_info_21.jpg
....\Img227152676.jpg
....\Img227797138.jpg
....\Img227797139.jpg
....\Img227797140.jpg
....\Img227797141.jpg
....\Img227797142.jpg
....\Img227797143.jpg
....\Img227797154.jpg
....\index_04.gif
....\logo.gif
....\logo0.gif
....\logo1.gif
....\l_info_21.jpg
....\reg_09.jpg
....\sde_22.jpg
....\top_01.jpg
....\u=1096003543	1722367321&gp=3.jpg
....\u=152192469	309358592&gp=1.jpg
....\u=1993628817	399009910&gp=3.jpg
....\u=2105289975	2309010909&gp=2.jpg
....\u=271169416	3793679699&gp=1.jpg
....\u=3700440152	3122544682&gp=1.jpg

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