While using a DBMS$,$ Ginny attempts to access a record that she needs to alter, but finds that she can view but not change the record. She turns to another task for a few minutes, then tries again and successfully modifies the record. It is most likely that Ginny$$s access to the record was initially limited by her DBMS$$s $\_\_\_\_\_$ feature.

A$.$ serializability

B$.$ optimization

C$.$ distribution

D$.$ normalization