You want to perform the following operations for the DATA ASM disk group: -Verify the consistency of the disk.  -Cross-check all the file extent maps and allocation tables for consistency. check whether the alias metadata directory and file directory are linked correctly.  -Check that ASM metadata directories do not have unreachable allocated blocks.   Which command accomplishes these tasks()?
A: ALTER DISKGROUP data CHECK
B: ALTER DISKGROUP data CHECK DISK
C: ALTER DISKGROUP data CHECK FILE
D: ALTER DISKGROUP data CHECK DISK IN FAILURE GROUP 1
出自:Oracle认证