1. The bank account balances are: a-900, b=300, c-1000. What possible account balances can appear after concurrent execution of transactions: bank transfer of 150 from a to c: bank transfer of 20 from b to c if (b20) (ABORT) else if (a < 150) (ABORT) else {a: a 150; ra m c; rara + 150; c: raj (b: b-20; rb c; rb rb + 20; c:=rb) Modify the transactions so that their outcome would be correct. What is the outcome (account balances)?

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