Examinethissyntaxwhichallocateschannelsduringaparallelimagecopy：RMANCONFIGUREDEVICETYPEdiskparallelism4：2COPY3datafile1TO‘/BACKUP/datafile1.dbf’，4datafile2TO‘/BACKUP/datafile2.dbf’，5datafile3TO‘/BACKUP/datafile3.dbf；RMANCOPY2datafile4TO‘/BACKUP/datafile4.dbf’；Howmanychannelsareused？（）A.0B.1C.3D.4
Examinethissyntaxwhichallocateschannelsduringaparallelimagecopy：RMAN>CONFIGUREDEVICETYPEdiskparallelism4：2>COPY3>datafile1TO‘/BACKUP/datafile1.dbf’，4>datafile2TO‘/BACKUP/datafile2.dbf’，5>datafile3TO‘/BACKUP/datafile3.dbf；RMAN>COPY2>datafile4TO‘/BACKUP/datafile4.dbf’；Howmanychannelsareused？（）
A.0
B.1
C.3
D.4