Consider table bank_accounts = (account_id, balance), with two accounts A and…

Consider table bank_accounts = (account_id, balance), with two accounts A and B initially holding Rs. 5,000 each. Two transactions execute concurrently under REPEATABLE READ isolation with standard locking. T1 transfers Rs. 1,000 from A to B and executes BEGIN; READ(A); READ(B); WRITE(A); WRITE(B); END. T2 transfers Rs. 1,000 from B to A and executes BEGIN; READ(B); READ(A); WRITE(B); WRITE(A); END. Each transaction reads both balances, deducts Rs. 1,000 from its source account, adds Rs. 1,000 to the other account, and writes the results. Assume all interleavings are possible and no external factor changes the balances. Which outcome can never occur?