1. Lee and his girlfriend are the loyal customers of CityBank. Yesterday when his girlfriend and he tried to withdraw cash separately from two different ATMs, their common account was locked accidently. The bank told them some transaction errors were causing a deadlock on their account. They are confused by the transactions and the deadlock. As their friend and an IT professional, you are trying to understand what happened technically. (5 marks)

1. Was any exclusive lock implemented in this case and under which circumstances could it be granted? (3 marks)

Was there a deadlock? Provide a brief explanation