Measure by the number of requests a system or application can effectively support simultaneously.

• A. Vertical Scaling (Scaling Up)
• B. Scalability (Infrastructure Design)
• C. Horizontal Scaling
• D. Orchestration

Answer: (B)

Scalability is the ability of a system to grow and handle increasing load, such as more concurrent requests, without degraded performance. The statement describes measuring how many requests can be served simultaneously, which is the practical way to assess scalability. Vertical scaling and horizontal scaling are two methods to achieve scalability—adding more resources to a single machine versus adding more machines. Orchestration helps manage and deploy components at scale but doesn’t by itself define the system’s capacity. So the best fit is scalability, reflecting the design and architecture that enable handling more concurrent requests.