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View the Exhibit for some of the current parameter settings. A user logs in to the HR schema and issues the following commands: SQL> CREATE TABLE emp (empno NUMBER(3), ename VARCHAR2(20), sal NUMBER(8,2)); SQL> INSERT INTO emp(empno,ename) VALUES(1,'JAMES'); At this moment, a second user also logs in to the HR schema and issues the following command: SQL> ALTER TABLE emp MODIFY sal NUMBER(10,2); What happens in the above scenario?（）
A:The second user's session immediately produces the resource busy error.
B:The second user's command executes successfully.
C:The second user's session waits for a time period before producing the resource busy error.
D:A deadlock is created.

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出自：Oracle认证

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