单项选择题
A.expdp scott/tiger directory=dpdata1dumpfile=expdp.dmp Tables=all;
B.expdp scott/tiger DUMPFILE=scott.dmp DIRECTORY=dmpdir SCHEMAS=SYS;
C.expdp system/manager DIRECTORY=dpdata1DUMPFILE=full.dmp FULL=y
D.expdp system/manager DIRECTORY=dpdata1DUMPFILE=full.dmp TABLESPACES=all