A.expdp system/system directory=DATA_PUMP_DIR dumpfile=scott.dmp schemas=SCOTT content=metadata_only
B.expdp system/system directory=DATA_PUMP_DIR dumpfile=scott.dmp schemas=SCOTT content=all
C.expdp system/system directory=DATA_PUMP_DIR dumpfile=scott.dmp schemas=SCOTT content=data_only
D.expdp system/system directory=DATA_PUMP_DIR dumpfile=scott.dmp schemas=SCOTT content=meta_only