A retail company is implementing a case management system within Microsoft Dynamics 365 Commerce to handle customer service inquiries more effectively. The system needs to categorize cases based on urgency and type of inquiry. The company has defined three categories: \"High Urgency,\" \"Medium Urgency,\" and \"Low Urgency.\" Each category has specific response time targets: High Urgency cases must be addressed within 1 hour, Medium Urgency within 4 hours, and Low Urgency within 24 hours. If a case is categorized as High Urgency, the system automatically assigns it to a senior customer service representative. If a case is categorized as Medium Urgency, it is assigned to a regular representative. However, if a case is not addressed within its target response time, it escalates to the next urgency level. Given that a case was initially categorized as Medium Urgency but was not addressed within the 4-hour window, what will happen to this case?