Which of the following is an example of Low severity per Dynatrace support policy?

The correct option demonstrates a situation where a low severity issue is categorized strictly by the response time defined by Dynatrace support policy. Specifically, a response time of four business days indicates a low severity level, as it signifies that the issue is not critical to the overall functionality or performance of the application.

In contrast, options like an application being down with no workaround or core functionality not available imply significant disruptions that would require urgent attention and thus represent higher severity levels. These scenarios suggest that the system is considerably impaired, affecting overall usability and necessitating a quicker resolution. An application being partially down may also indicate serious issues that need swift intervention. Hence, the three former options denote situations that are far more urgent than what a four-business-day response time would cover, thereby categorizing them as higher severity issues.