Is the measure of a system’s ability to expand, change, or downsize easily to meet the changing needs of a business enterprise.

Scalability

Explanation:

A scale able system is a system which can downsize or expand according to the user needs if more resources are needed to meet user needs system increases it's resources on its own and when it's over system goes back to a pre-defined minimum state. AWS cloud provides such services to user  

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menu bar because you can do commands and you can and has many uses and tools.

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yes you can very simple, click the heart and then click the follow requests button.