Which of the following describes cross-border services?

The correct choice accurately defines cross-border services as those that are sent across national borders. This highlights the essence of such services, which includes activities like consulting, legal services, education, and financial services that are provided to clients located in a different country than the service provider. The significance of cross-border services lies in their ability to transcend geographic limitations, allowing businesses to offer their expertise and commodities globally, thus expanding market reach and opportunities.

The other options focus on different concepts that do not pertain specifically to services. For instance, services delivered within the same country relate to domestic service provision, which does not involve cross-border activity. Goods transported over international boundaries refers to tangible items rather than services, and products sold to foreign residents captures another aspect of international trade but again emphasizes goods instead of services. Overall, the correct answer encapsulates the idea that cross-border services are fundamentally about services moving across international lines, distinguishing them from goods and domestic transactions.