Setting CurrencyIsoCode to a value that is not defined for an organization leads to:

Zeroing CurrencyIsoCode field. The currency field keeps its value

Operation to be rejected. The currency keeps its value.

Operation to be rejected. CurrencyIsoCode keeps its value.

Zeroing CurrencyIsoCode field. Zeroing the currency field.

Answer:
Operation to be rejected. CurrencyIsoCode keeps its value.

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