Which of the following statements is/are correct

a) The RBI  can collect credit information from banking companies.

b)Furnish such information to any banking company in accordance with the provisions of section 45D of the RBI act.

c) Credit information means any information relating to the guarantee furnished by a banking company for any of its customers.

d) RBI shall not be liable to pay income tax or super tax on any of its income, profits or gains.