【单选题】
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’； <br /> Before user A issues a COMMIT or ROLLBACK command， user B executes the following command on the TRANS table：  <br /> SQl> ALTER TABLE trans MODIFY （tr_type VARCHAR2 （3））； <br /> 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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