Answer:
lost-update program
Step-by-step explanation:
lost-update program is problem that occurs in database system when two different data or transaction are simultaneously saved on the same column and on the same row within a database. This conflict results to the loss of the first part of the saved data because it will be overwritten by the other different data for transaction.
From the question, Charles and Irene are working on the same copy of data, Charles's data overwrite Irene's leading to what is known as lost-update program