Concept:The central bank differs from commercial banks because it acts as a final safety net for the banking system.
Explanation:Central banks do not serve the general public directly like commercial banks.
Giving loans to the public, saving individual valuables, and discounting treasury bills are normal functions of commercial banks.
However, when a commercial bank faces a serious financial shortage and cannot borrow anywhere else, the central bank steps in.
This makes the central bank the lender of last resort, a unique duty not performed by commercial banks.
Answer:D. serves as lender of last resort.