【单选题】
A It will return an error because EMP.SAL is empty in APP_ROOT
B SAL will be added t APP_PDB1.EMP,with o in columns of existing rows.
C lt will return an error because EMP is not empty in APP ROOT.
D SAL will be added to APP PDB1.EMP, with NULLs in columns of existing rows.
E lt will return an error because the SYNC operation is not allowed when constraints areadded to common obiects.
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