An API client makes an HTTP request to an API gateway with an Accept header...

Content Negotiation:The HTTP Accept header is used by the client to tell the server what media type (format) it expects in the response4444.

application/json:This MIME type explicitly requestsJSON(JavaScript Object Notation).

Analyzing the Options:

(B) {"status": "healthy"} is valid JSON format (Key-Value pair wrapped in braces).

(C) status>healthy is XML.

(A) is YAML or Plain Text.