The uploaded study guide identifies C. Heroku, Visualforce, Android as the correct set of platforms on which SLDS resources can be used.
The question is testing the portability of the Salesforce Lightning Design System beyond a single Salesforce interface. SLDS provides design resources that can help designers create visual and interaction consistency across different environments associated with Salesforce solutions.
The study guide specifically selects Heroku, Visualforce, and Android. This illustrates the broader purpose of a design system: reusable design principles, patterns, component guidance, and styling resources can support consistency across multiple implementation contexts.
Option A includes Azure, Visual Studio, and .NET, which are not the combination identified by the guide.
Option B includes AWS, Aura, and iOS. Although Aura is part of the Salesforce ecosystem, the complete three-item set is not the answer specified by the study guide.
The important UX lesson is that a design system is not merely a collection of styles for one page type. It provides a common design language that can be applied across experiences so that users encounter recognizable patterns, visual hierarchy, interaction behavior, and brand treatment.
Study Guide reference/topics: SLDS resources, cross-platform consistency, Heroku, Visualforce, Android, Salesforce Lightning Design System.
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