[单选]
You execute the following command in your Supportcenter.cn production database to change the width of the CUST_NAME column of the CUSTOMERS table： ALTER TABLE customers
MODIFY （cust_nameVARCHAR2 （40））
/
When you execute the command， it displays the following error message：
ERROR at line 1：
ORA-00054： resource busy and acquire with NOWAIT specified
What could be the reason for the error message？（）

A . The database instance is not available.
B . The ALTER TABLE command does not have WAIT option
C . The table or a row in the table is currently locked by another user session.
D . The database instance is busy processing other user sessions commands.
E . The CUSTOMERS table has no long running query active at the time when this request is made.
F . The server process executing the ALTER TABLE command is busy with another command executio

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You execute the following command in your Supportcenter.cn production database to change the width of the CUST_NAME column of the CUSTOMERS table： ALTER TABLE customers
MODIFY （cust_nameVARCHAR2 （40））
/
When you execute the command， it displays the following error message：
ERROR at line 1：
ORA-00054： resource busy and acquire with NOWAIT specified
What could be the reason for the error message？（）

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