Explanation:

- M1 includes currency with the public, demand deposits with the banking system, and other deposits with the RBI. It is the most liquid form of money supply.

- M2 adds savings deposits with post office savings banks to M1. It is slightly less liquid than M1.

- M3 includes M1 plus time deposits with the banking system. It is broader and less liquid than M1 and M2.

- M4 combines M3 with all the deposits in post office savings accounts, except for national savings certificates. It is the broadest measure.

- All of these options are measures of the money supply in India.