Name the financial instrument which may be used in the following situations:
(i) A company needs funds to meet floatation cost in order to issue equity shares in the market.
(ii) The instrument that is issued during the period of tight liquidity when the deposit growth of bank is slow but demand for credit is high.
(iii) These are also known as zero coupon bonds and are isssued by RBI on the behalf of central goverment.
(iv) It is used by one bank having surplus funds to meet the funds requirements of another bank facing shortage of funds.