In Distributed system, the capacity of a system to adapt the increased service…

Answer: Scalability

Scalability is the capacity of a distributed system to adapt to increased service load by adding resources or redistributing work while keeping performance within acceptable bounds.

• Vertical scaling: increasing the capacity of existing nodes (for example, more CPU or RAM).

• Horizontal scaling: adding more nodes or instances to share the load.

• Autoscaling: dynamically adjusting resources based on current demand.

Why the other choices are not correct:

• Tolerance typically refers to fault tolerance—the ability to continue operating despite failures—not the ability to handle more load.

• Capability is a generic term for an ability and does not specifically mean handling increased service load.

• Loading refers to the amount of demand or work placed on the system, not the system’s capacity to adapt to that demand.