Your network contains an enterprise root certification authority （CA）. You need to ensure that a certificate issued by the CA is valid. What should you do（）

A. Run syskey.exe and use the Update option. he safer ，easier way to help you pass any IT exams. 4 / 90
B. Run sigverif.exe and use the Advanced option.
C. Run certutil.exe and specify the -verify parameter.
D. Run certreq.exe and specify the -retrieve parameter.