The correct answer is D. Workflow optimization in Business Automation Workflow depends heavily on modular, reusable design. Reusable components reduce duplication, improve maintainability, and make workflows easier to scale, test, troubleshoot, and evolve. Reusable views are collections of user interface widgets that can be composed from other views, bindings, layouts, and behaviors. Workflow modernization in Cloud Pak for Business Automation also includes reusable automation services that can be published and called from workflows. This architecture allows common functions, such as approvals, notifications, validation, enrichment, or user-interface fragments, to be built once and reused consistently across multiple workflow automations. Option A is incorrect because testing remains essential even for small workflow changes, especially in regulated or production environments. Option B weakens automation value by replacing rule-based assignment with manual routing. Option C is the opposite of the recommended practice because non-modular workflows become hard to govern and change. References/topics: Business Automation Workflow optimization, reusable views, reusable automation services, modular workflow design, maintainability and scalability.