Universal Containers (UC) delivers training and courses to students and companies.

For Customer Community licenses, the most optimal and Salesforce-recommended method to share cases with users is through a Sharing Set. Sharing Sets allow administrators to grant access to records associated with the user's account or contact, based on their profile and account relationship.

Option A: Apex sharing could accomplish this, but it is unnecessary overhead and more complex compared to Sharing Sets, especially for straightforward account-related sharing.

Option B: Sharing rules do not apply to community licenses such as Customer Community and are not an effective solution in this context.

Option C (Correct): Sharing Sets provide a declarative solution to meet the requirement. By configuring a Sharing Set, UC can grant students access to cases linked to their account without needing custom code or complex configurations.