题目内容

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

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