【单选题】
下列哪一项是创建控制文件的命令()。
A、create controlfile set database “ORCL”;
B、create spfile from pfile;
C、alter database backup controlfile to trace
D、alter database archivelog
A、create controlfile set database “ORCL”;
B、create spfile from pfile;
C、alter database backup controlfile to trace
D、alter database archivelog