Explanation:

Universal Containers (UC) wants Omni-Channel to route cases based on:
Customer's preferred language
Agent expertise (knowledge to solve the issue)
This is a classic use case for Skills-Based Routing, which ensures work is assigned to agents who have specific skills — such as language fluency or product knowledge — rather than simply assigning work based on queues or load.

🔍 A. Configure Omni-Channel Skills-Based Routing ✅
Skills-Based Routing is an enhancement of Omni-Channel routing.
It allows you to define skills (e.g., “Spanish,” “Product X Expertise”) and assign them to:
Agents
Work items (like cases)
Omni-Channel then routes cases only to agents who meet the required skills.
Perfect for multi-language and product-specific support scenarios.
✅ Fully meets the requirement for language and expertise-based routing

🔍 B. Configure Case Assignment Rule and Omni-Channel Supervisor
Case Assignment Rules assign cases to queues or users based on conditions like origin or subject.
Omni-Channel Supervisor is used to monitor agent activity, not route work.
This combo does not route based on agent skills like language or product knowledge.
🔴 Insufficient for skill-based routing needs

🔍 C. Configure Omni-Channel Queue-Based Routing
This method routes cases based on queues.
You can assign agents to queues for basic routing, but:
Queues are static and don’t evaluate skills
It can’t ensure the right language or product knowledge match
🟡 Useful for simple routing, but not intelligent or dynamic enough for this use case

📚 References:
Salesforce Help: Skills-Based Routing in Omni-Channel
"Route work to the best available agents based on their skills to resolve the issue."
Trailhead: Omni-Channel Routing

✅ Final Answer: A. Configure Omni-Channel Skills-Based Routing
Because it routes cases intelligently to agents who speak the right language and have the right expertise, fulfilling both requirements.