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The feature that your OS and hardware must  support to allow you to perform the upgrade without shutting the server down is option B) load balancing.
What makes load balancing to be crucial?
In the area of computing, Â By uniformly distributing network traffic, load balancing enables you to avoid resource failure brought on by resource overload. The performance and accessibility of apps, websites, databases, and other computing resources are enhanced by this tactic. Additionally, it aids in precisely and swiftly handling user requests.
Note that Load balancing, commonly referred to as server farming or server pools, is the process of efficiently dispersing incoming network traffic among a collection of backend servers.
Therefore, one can say that by dispersing the workload across different servers, load balancing is a crucial part of highly-available infrastructures, which are frequently used to increase the performance and dependability of websites, apps, as well as databases, and other kinds of services.
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you have noticed that your server's performance has been slowly diminishing. you have determined that the server needs additional memory. however, you do not want to shut down the server to add memory. Â What feature must your OS and hardware support to allow you to perform the upgrade without shutting the server down? O clustering O load balancing O hot-add O EPT