（单选题）
You work as a database administrator for Supportcenter.cn. You started the instance using theinit.orafile. You have two control files and three redo log groups in your database. You decided to protect the database against failures by adding one more control file. Which file is the appropriate way to perform this task？（）
AShut down the instance， copy the control file to the third location and open the database.
BAbort the instance， copy the control file to the third location， modify the CONTROL_FILES parameter in theinit.orafile and open the database.
CCopy the control file to the third location， modify the CONTROL_FILES parameter in theinit.orafile， restart the instance and open the database.
DShut down the instance， copy the control file to the third location， modify the CONTROL_FILES parameter in theinit.orafile and open the database.
EShut down the instance， startup in the mount state， copy the control file to the third location， modify the CONTROL_FILES parameter ininit.oraand open the database.
正确答案
答案解析
略
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