单项选择题

A.The transaction for user A is rolled back.B.The ALTER……

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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