Let's consider a diary that is replicated across datastores. There are two users, Helen and Don. They always interact with the closest replica of the diary datastore. While in New York, Helen reads her diary and notes down her appointments written previously. While Helen is traveling from New York to Arlington, Don updates Helen's dairy in New York by changing the time of her Arlington appointment. Helen subsequently misses her appointment because the Arlington replica doesn't reflect Don's changes.

What client$-$centric consistency models describe this behavior?