Option 1 -> Includes Medium of exchange, Unit of account, and Store of value - the three primary functions of money.
Option 2 -> Incorrectly includes 'Unit of purchasing power' instead of 'Store of value'.
Option 3 -> Incorrectly includes 'Unit of purchasing power' which is not a standard function of money.
Option 4 -> Excludes 'Medium of exchange' which is the most fundamental function of money.
Hence, Option 1: (A), (B) and (D) only -> The three primary functions of money are: (1) Medium of Exchange - money facilitates trade by eliminating the need for double coincidence of wants, (2) Unit of Account - money provides a common measure to value goods and services, and (3) Store of Value - money can be saved and used for future purchases. 'Unit of purchasing power' (C) is not a recognized function of money; rather, purchasing power is a characteristic that describes how much goods/services money can buy, which varies with inflation. -> correct