The correct answer is A. scalability.
Scalability is the ability of a system to handle an increased service load. It is a measure of how well a system can be expanded to meet the needs of its users. Scalability can be achieved in a number of ways, such as by adding more hardware, software, or network capacity.
Tolerance is the ability of a system to withstand failures without disrupting service. It is a measure of how well a system can recover from unexpected events. Tolerance can be achieved in a number of ways, such as by using redundant components or by implementing fault tolerance mechanisms.
Capacity is the maximum amount of work that a system can handle. It is a measure of the system’s resources, such as its processing power, memory, and storage. Capacity can be increased by adding more resources to the system.
None of the mentioned is not the correct answer because it does not describe the capability of a system to adapt the increased service load.