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单项选择题 View the Exhibit and examine the parameters. 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 onthe TRANS table：  SQL> ALTER TABLE trans MODIFY （tr_type VARCHAR2（3））；  What would happen in this scenario（）

A、The ALTER TABLE command modifies the column successfully.

B、The DDL operation gets higher priority and transaction for user a is rolled back.

C、The ALTER TABLE command waits indefinitely until user a ends the transaction.

D、The ALTER TABLE command fails after waiting for 60 seconds due to the resource being busy.

  • D

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