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User A executes the following command to update the TRANS table）  SQL> UPDATE B.trans SET tr_amt=tr_amt+500 WHERE c_code=’C005’；  Before user A issues a COMMIT or ROLLBACK command， user B executes the following command on the TRANS table：   SQl> ALTER TABLE trans MODIFY （tr_type VARCHAR2 （3））；  What would happen in this scenario？（）
A:The transaction for user A is rolled back.
B:The ALTER TABLE command modifies the column successfully.
C:The ALTER TABLE command fails due to the resource being busy.
D:The ALTER TABLE command waits until user A ends the transaction.

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出自：Oracle认证

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