What would happen in this scenario?

See 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 on the TRANS table:
SQL> ALTER TABLE trans MODIFY (tr_type VARCHAR2(3));
What would happen in this scenario?
Exhibit:

See 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 on the 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



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