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Changing an allowance from 100 to 50

Alice approved Bob for 100 tokens. She now calls `approve(bob, 50)`. Bob watches the mempool. What is the worst case?

A.Bob can spend at most 50 after the changeB.Bob spends the 100 first, then the new 50, taking 150 in totalC.The second approve reverts while the first is unusedD.Bob's spend reverts because the allowances clash

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Changing an allowance from 100 to 50

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