Option 1 -> Correctly identifies the three main functions of money: medium of exchange, unit of account, and store of value.
Option 2 -> Incorrectly includes bartering, which is not a function of money but rather a system that existed before money.
Option 3 -> Incorrectly includes bartering along with the actual functions of money.
Option 4 -> Excludes medium of exchange (which is a primary function) and incorrectly includes bartering.
Hence, Option 1: (A), (B) and (D) only -> Money serves three primary functions: (A) Medium of exchange - facilitates buying and selling of goods and services; (B) Unit of account - provides a common measure of value for pricing; (D) Store of value - allows wealth to be saved for future use. Bartering (C) is the direct exchange of goods/services without money, representing a pre-money economic system, not a function of money itself. -> correct