For Ursa Major Solar, after hiring many new agents to handle increased call volumes, the most effective strategy is to build an Omni-Channel routing flow and include all senior agents in the direct-to-agent routing protocol. This approach ensures that experienced agents are prioritized for more complex calls, helping to maintain high quality of service during peak periods. Omni-Channel routing efficiently distributes incoming calls based on agent expertise, availability, and workload, which helps to manage the increased volume without compromising service quality.
Reference: Omni-Channel Routing

Seamless integration of an existing CRM system with Salesforce can be best facilitated through Partner Integrations. Salesforce offers a variety of pre-built integrations through its AppExchange, which includes many solutions developed by partners specifically for integrating various CRM systems. This approach provides standardized, supported, and scalable integration options, making "D. Partner Integrations" the optimal choice for such requirements.
Reference: Salesforce AppExchange

Measuring the effectiveness of self-service options effectively involves tracking multiple metrics: the number of cases deflected by self-service tools, customer satisfaction ratings after using these options, and comparing resolution times between self-service and traditional support channels. This combination of metrics provides a holistic view of how well self-service options are meeting customer needs and where improvements might be necessary to enhance efficiency and user satisfaction.
References: https://help.salesforce.com/articleView?id=sf.service_channel_analytics.htm

Prioritizing First Call Resolution (FCR) is essential when customer satisfaction is the top priority, as FCR directly impacts customer experience by resolving their concerns or queries in the initial interaction.
Improving FCR can significantly enhance customer satisfaction because it reduces the need for follow-up calls, thus saving time and improving the overall customer experience.
Reference: Salesforce Service Cloud Metrics