Beautiful Shoes Inc. is a high-end women's shoe store. It has recently expanded its operations and signed a long-term lease in a popular shopping centre. The owner, Beverly Hung, is concerned because the lease agreement requires that she submit to the landlord a percentage of her gross sales at the end of the calendar year. The lease indicates she must also provide a report on the gross sales. The landlord would like some assurance over the report.

Which of the following reports would meet the landlord's requirements?

1. An audit of historical financial statements
2. A review engagement on interim financial statements
3. An audit of single financial statements and specific elements, accounts, or items of a financial statement
4. A report on specified procedures
5. A report on the application of accounting principles
6. A Notice to Reader