What is the balancing of accounts?

The correct answer is option 3- Difference in total of debit side & credit side.

Accounts in the ledger are periodically balanced, generally at the end of the accounting period, with the object of ascertaining the net position of each amount. Balancing of an account means that the two sides are totaled and the difference between them is shown on the side, which is shorter in order to make their totals equal. The words ‘balance c/d’ are written against the amount of the difference between the two sides. The amount of balance is brought (b/d) down in the next accounting period indicating that it is a continuing account, till finally settled or closed.