What architectural approach allows a modular software design separated by layers and tiers?

The multitiered architecture approach is designed specifically to promote a modular software design by separating the system into distinct layers or tiers. This architecture often involves organizing applications into layers such as presentation, business logic, and data storage. Each layer serves a specified role, which allows for better organization, maintainability, and scalability of the software system.

In a multitiered architecture, each layer can be developed and updated independently, making it easier to manage complexity and enhance the overall system without needing to overhaul the entire application. For instance, you may upgrade the data access methods without affecting the business logic or the user interface, facilitating continuous improvement and rapid deployment of new features.

Additionally, this layered approach supports various technologies and scales well with increased demand, which is crucial in modern applications that must adapt quickly to user needs. The separation of concerns inherent in multitiered architectures also aids in isolating issues for troubleshooting and allows different teams to work simultaneously on different layers of the application.

The other options do not reflect this modular and layered approach. While storage, networking, and computing services are fundamental components of software architecture, they do not inherently provide the structured separation and flexibility that multitiered architecture offers.