For Product A with the given dates, by November 22, 2021, the product is past its Selling End Date but has not yet reached its End of Life Date. Therefore, the product cannot be added to a cart or modified since it's no longer available for new sales, but it can still undergo service-related actions. The appropriate action that can be taken is "Disconnect," as this action pertains to service or subscription-based changes, such as terminating or disconnecting a service that has been previously sold or activated, but is not yet at its end of life.