A banking system provides users with several services: (i) to check their accounts to see recent transactions and balances; (ii) to pay bills online; (iii) to buy and sell investments. All of these services require a secure log-in. If the system crashes or the network connection fails during a transaction, it is essential that all the financial data is left in a consistent state. (a) Draw use case diagrams for these requirements. (b) Give the use case specification for paying a bill online.
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