Question: What action should a User Equipment (UE) take when encountering an `r12:appService` element with an unsupported `mimeType` attribute value in an MBMS application service description?
Option 1: Attempt to parse the element using a default MIME type
Option 2: Request an updated profile from the network to support the MIME type
Option 3: Skip the entire Application Service Description and seek alternative sources
Option 4: Ignore the `r12:appService` element and continue processing other elements
Explanation: According to the specifications for handling MBMS application service descriptions, if a UE encounters an `r12:appService` element with a `mimeType` attribute value it does not support, it should ignore that specific element. This ensures the UE can still utilize other supported elements within the description, maintaining partial functionality and avoiding complete service disruption. This approach prioritizes compatibility and graceful degradation of service.