To efficiently gather information on Knowledge article usefulness, installing the Knowledge Base Dashboards & Reports package from Salesforce AppExchange is advisable. This package provides pre-built reports and dashboards designed specifically for Salesforce Knowledge, enabling quick insights into article performance, usage, and feedback, facilitating continuous improvement in Knowledge management.

Explanation
This is the question that should be asked to determine the preferred solution, because it indicates whether CK needs to use Service Contracts or not. Service Contracts are agreements between a company and a customer that specify the duration and level of support for a product or service. If CK provides support on a periodic basis and renews it annually, then they should use Service Contracts along with Entitlements. If CK provides support based on other factors, such as number of cases or products purchased, then they can use Entitlements only. Verified References: : Service Contracts and Entitlements

Explanation
Creating a Custom Report type with activities as the primary object is the recommended way to create a report on agents' daily call volume, including related case and contact information. A Custom Report type is a type of report that allows you to select the objects and fields that you want to report on, as well as define the relationships between the objects. By selecting activities as the primary object, you can report on the calls that agents have made or received, as well as filter them by date, duration, or status. By selecting case and contact as related objects, you can report on the details of the cases and contacts that are associated with the calls, such as case number, case owner, contact name, or contact phone number. Verified References: Service Cloud Consultant Certification Guide & Tips, Create Custom Report Types