Which three object types can a developer import using the Merchant Tools > Content > Import & Export module in Business Manager? (Choose three.)

A Digital Developer selects "Show Orderable Products Only" in the Search > Search Preferences Business Manager module.
Which business goal does this accomplish?

A developer customized the Cart-Show controller route with a LINK cartridge that adds social media dat a. There is a new requirement to add a datalayer object to the Cart-Show controller route.
How should the developer achieve this to ensure that no code change will be needed if the client decides to remove the LINK cartridge?

Which method is efficient and scalable because it uses the product search index rather than searching the database?

A merchant wants customers to be able to order gift vouchers via their site. Since they can issue an unlimited number of these digital vouchers, this item should be available to sell at all items.
How can a developer use Business Manager to ensure that the gift vouchers are always available?