下列那条命令能够实现全库导出()
A、expdp scott/tiger DUMPFILE=scott.dmp DIRECTORY=dmpdir SCHEMAS=SYS
B、expdp system/manager DIRECTORY=dpdata1 DUMPFILE=full.dmp TABLESPACES=all
C、expdp system/manager DIRECTORY=dpdata1 DUMPFILE=full.dmp FULL=y
D、expdp scott/tiger directory=dpdata1 dumpfile=expdp.dmp Tables=all