GraphQL Introspection is a built-in feature of GraphQL that allows clients to query the schema of a GraphQL API at runtime. This process involves sending introspection queries (e.g., __schema or __type) to retrieve information about the API’s structure, including available types, fields, queries, mutations, and their relationships. This capability is powerful for developers to explore and document APIs but poses a security risk if left enabled in production, as attackers can use it to map out the entire API structure and identify potential attack vectors.
Option A ("A technique for testing the compatibility of the GraphQL API with other systems"): Incorrect, as introspection is about schema discovery, not compatibility testing.
Option B ("A technique for testing the performance of the GraphQL API"): Incorrect, as performance testing involves load or stress testing, not schema exploration.
Option C ("A technique for discovering the structure of the GraphQL API"): Correct, as introspection is specifically designed to expose the API’s schema and structure.
Option D ("A technique for testing the security of the GraphQL API"): Incorrect, as security testing is a separate process; introspection itself is a feature, not a security test.
The correct answer is C, aligning with the CAP syllabus under "GraphQL Security" and "API Introspection."References: SecOps Group CAP Documents - "GraphQL Fundamentals," "Introspection Risks," and "OWASP API Security Top 10" sections.
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