A load balancer distributes incoming traffic evenly across multiple servers to prevent any single server from becoming overloaded. This ensures high availability, scalability, and optimal performance of the company's website.

During containment, you first pinpoint exactly what malware or attack vector is in play and how far it has spread - i.e. identifying the threat. Then, in the eradication phase, you eliminate the root cause by removing the malicious threat (malware, backdoors, unauthorized accounts, etc.) before moving on to system recovery.

EDR (Endpoint Detection and Response) is the most suitable solution among the given options for detecting the presence of a rootkit. EDR solutions continuously monitor and collect data from endpoints, looking for suspicious activities and behavior patterns that might indicate the presence of malware, including rootkits. They also provide tools for investigating and responding to security incidents, making them effective for dealing with sophisticated threats that can evade traditional antivirus solutions.

Avoidance involves choosing not to engage in activities or markets where certain risks are present. This is a proactive approach to risk management.