What could be the reason for this?

You specified the warning and critical thresholds for a locally managed tablespace to be
60% and 70%, respectively. From the tablespace space usage metrics, you find that the
space usage has reached the specified warning threshold value, but no alerts have been
generated. What could be the reason for this?

A.
Enterprise Manager was not used.

B.
The statistics_level parameter is set to basic.

C.
The sql_trace parameter is set to false.

D.
The event parameter was not set.

E.
The t:kid_statistics parameter is set to false.