Question: In a 5G System, according to 3GPP guidelines, what should be included in the HTTP response header field when a 'ProblemDetails' data structure is present in the payload body of an error response?
Option 1: Content-Type set to "application/problem+json"
Option 2: Error-Type set to "Application Error"
Option 3: Response-Code set to the specific HTTP error code
Option 4: Accept set to "application/json"
Explanation: According to the guidelines for 5G System error handling, when a 'ProblemDetails' data structure is included in the response body of an HTTP error response, the NF/NF service generating the response must specify a Content-Type header field set to "application/problem+json". This informs the client about the format of the error details provided in the response body, facilitating proper handling and interpretation of the error information.