Explanation:

- Commercial Banks:

- These institutions are primarily focused on accepting deposits, granting loans, and making investments.

- Their main goal is to generate profits through various financial services.

- They serve individuals, businesses, and sometimes government entities.

- Correct Answer

- Central Bank:

- It is the principal monetary authority of a country.

- Its main role is to regulate the money supply and stabilize the financial system.

- It does not engage in regular commercial banking activities like profit-making.

- Neither a) nor b):

- This option suggests that neither commercial banks nor the central bank perform the functions described, which is incorrect.

- Both a) and b):

- Incorrect, as only commercial banks primarily focus on profit-making through these activities.