The sales income (Credit and Cash) of a business during a given period is called

Turnover refers to the total sales revenue generated by a business from selling goods or services during a specific period, including both credit and cash sales.

Transactions is incorrect because it refers to any business activity involving the exchange of goods, services, or funds, not specifically sales income.

Sales Returns is incorrect because it refers to goods that customers return to the business after purchase, reducing the total sales income.

Purchase Returns is incorrect because it refers to goods that the business returns to suppliers, not related to sales income.

Therefore, the correct answer is Turnover.