Which of the following are criteria to order Product Backlog items?

A Product Owner orders a Product Backlog in any way they think will maximize the value of the product1. They take various factors into consideration when ordering the Product Backlog such as business value, risk, return on investment (ROI), dependencies and impact1. Dependencies between Product Backlog items and their relevance to achieving the Product Goal are two of these factors12. The availability of the Scrum Master and the number of stakeholders who approve of the item are not valid criteria for ordering the Product Backlog3.