When the Fed acts as a "lender of last resort," like it did in the financial crisis of 2007-2008, it is performing its role of

The answer is Banker's bank

Explanation:

The Fed is performing its role as a banker's bank. The Fed is the U.S or the central bank in most countries are referred to banker's bank. It acts a commercial bank for all banks in the country.

Commercial banks in all countries have an account with the central bank. Commercial banks also have access to very short-term loans when it is in the distress. Banker's bank(The Fed) has the sole authority for the money supply in the economy.

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