Which of the following books serves the purpose of both journal and ledger?

Cash book

The correct answer is option 1- Cash book.

Cash book is a book in which all transactions relating to cash receipts and cash payments are recorded. It starts with the cash or bank balances at the beginning of the period. Generally, it is made on monthly basis. This is a very popular book and is maintained by all organisations, big or small, profit or not-for-profit. It serves the purpose of both journal as well as the ledger (cash) account. It is also called the book of original entry. When a cashbook is maintained, transactions of cash are not recorded in the journal, and no separate account for cash or bank is required in the ledger.