Scalability is the feature that the allows the company maintained service performance by manually installing an additional load balanced server.
This is the term that is used to refer to the fact that a thing can be changed in its size or in its form. It has to do with the ability of a business to grow in size without having anything that would hamper its growth.
Here we can see that the growth in the workload did not affect the performance of the company. Despite the fact that they grew, they still continued to maintain installing an additional load balanced server. Hence the answer is scalability.
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