The following command is executed to create the baseline template：   SQL> EXECUTEDBMS_WORKLOAD_REPOSITORY.CREATE_BASELINE_TEMPLATE（START_TIME=> TO_TIESTAMP（SYSDATE+2），  END_TIME=>TO_TIMESTAMP（SYSDATE+10）， BASELINE_NAME=>’Mybase4’，  TEMPLATE_NAME=>’Mytemp4’， EXPIRATION=>NULL）；   Which statement is true about the effect of the above command？（）  

A.It creates a baseline template that never expires.

B.It produces an error because no snapshot information is provided to create the baseline.

C.It creates a baseline template that expires after the Automatic Workload Repository （AWR） retention period.

D.It creates a repeating baseline template that repeats after the Automatic Workload Repository （AWR） retention period.