Using the Rules of Validity, Find the Unstated Premise of the Following

Using the rules of validity, find the unstated premise of the following enthymeme? All banks are institutions with government-insured deposits.
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No hedge fund is a bank.

A) No hedge fund is an institution with government-insured deposits.
B) No bank is a hedge fund.
C) Some institutions with government-insured deposits are not hedge funds.
D) Some hedge funds are not banks.
E) No institution with government-insured deposits is a bank.