Brig Dollar lives in Detroit and her son lives in Des Moins. They have a joint bank account at Chase Bank. On Sunday morning both of them go to their local Chase bank ATM at $9$ am to withdraw money. Exactly at $9\mathrm{.}05$ am they both enter their credentials to withdraw. Next what would happen $?$

A The system ensures that transactions are executed in a manner that preserves the correctness of the database even when multiple operations are occurring simultaneously.

B The system uses mechanisms such as locking, isolation levels, and transaction management, prevents them from completing the transactions at the same time

C Since they have enough balance in their account and they have correct credentials, there won;t be any issues. They both get their money as they requested

D The system sends an alram to bank security