Where custom buttons can be placed? (Choose 3)

Universal Containers has a Lightning record page that supports both the mobile app and desktop. An app builder has downloaded a custom Lightning component from AppExchange, but users are unable to view the component on mobile devices.
What can be the issue?

A workflow has been written to update the 'Stage' field on opps. What will be the impact of this field update?

The DreamHouse Realty (DR) service manager has asked for some improvements in case management to enforce process compliance so that cases are unable to be reverted to an earlier case status, and to ensure that certain fields are required when specific case criteria are met.
What solution should an app builder implement to meet these requirements?

Universal container has a custom object for shipping information. They have to ship to both businesses and consumers. They need to show additional values in the custom field called insurance type for business shipping records. How can this be set up?