easy5 pts · first answer countserc-20tokens

Letting a contract spend tokens

A user wants a DEX contract to take 100 of their ERC-20 tokens in a swap. What is the standard flow?

A.The DEX reads the user's private keyB.The user calls transfer() on the DEX contractC.The token contract sends tokens automatically when you visit the DEXD.The user calls approve(dex, 100) on the token, then the DEX calls transferFrom(user, dex, 100)

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Letting a contract spend tokens

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