Final answer:
A Cross-functional team is a horizontal structure that brings together members of different departments to work collaboratively on specific goals or projects, aligning with modern business demands for flexibility and rapid response.
Step-by-step explanation:
The horizontal structure that brings together members of different departments such as marketing, production, and accounting is a Cross-functional team. This approach to organization structure is increasingly being adopted to respond to the complexities of today's business environment, where shifts in technology, economics, globalization, and workplace demographics demand rapid and flexible responses from companies. Cross-functional teams combine diverse skills, experience, and expertise and are tasked with working towards specific goals or projects. In this team-based structure, hierarchical barriers are reduced, fostering collaboration among team members of various ranks and departments.