You have created a database link， devdb.us.oracle.com，

单项选择题

You have created a database link， devdb.us.oracle.com， between the databases PRODDB and DEVDB. You want to import schema objects of the HR user using Oracle Data Pump from thedevelopment database， DEVDB， to the production database， PRODDB. You execute the following command on the target database server：
$impdp system/manager directory = DB_DATA dumpfile = schemas.dat schemas = hr
flashback_time = 2004-02-03 09：00
The command fails， displaying the following error： ORA-39001： invalid argument value
ORA-39000： bad dump file specification
ORA-31640： unable to open dump file “/home/oracle/schema/schemas.dat” for read ORA-27037： unable to obtain file status What would you do to overcome the error（）

A.remove the dumpfile option in the command
B.remove the flashback_time option in the command
C.remove the dumpfile option and add the network_link = devdb.us.oracle.com option in the command（Replace thedumpfile option with the network_link = devdb.us.oracle.com）
D.add the user， SYSTEM， to the schemas option in the command
E.remove the schemas option and add the network_link = devdb.us.oracle.com option in the command
F.add network_link = devdb.us.oracle.com option in the command

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