When one makes new friends, don't forget _____ old ones. [ ]

A. to put up with

B. losing sight of

C. to keep track of

D. keeping in touch with

配置PKI域所信任的CA（权威认证机构为）H3CCA，且配置注册服务器的URL为ca．h3c．com的命令分别为（）。

A.在PKI域视图下，配置ca.identifier H3CCA

B.在PKI域视图下，配置CErtificate identifier-H3CCA

C.在PKI域视图下，配置CErtificate request url ca.h3c.com

D.在PKI域视图下，配置CErtificate url ca.h3c.com