A company is implementing a new Salesforce solution to manage its customer relationships and sales processes. They have identified the need to establish a relationship between the Account and Contact objects, where each Account can have multiple Contacts associated with it. Additionally, they want to ensure that each Contact can be linked to multiple Opportunities, reflecting the various sales interactions that may occur. Given this scenario, which of the following best describes the type of relationships that should be established between these objects in Salesforce?