The correct answer is Azure Cosmos DB Gremlin API.

The Azure Cosmos DB Gremlin API is a managed, globally distributed graph database that natively supports the property graph model and the Apache TinkerPop Gremlin traversal language. It scales horizontally to handle very large graphs and provides low latency traversals which makes it suitable for detecting fraud across hundreds of millions of relationships.

Azure SQL Database is a relational database and while it offers some graph extensions it is not optimized as a purpose built Gremlin property graph store for high performance traversals at massive scale.

Azure Data Lake Storage is an object store for large analytical data files and not a graph database so it cannot execute Gremlin traversals or serve as an operational property graph store.

Azure Databricks is a powerful analytics and processing platform that can perform batch graph computation with libraries such as GraphFrames. It is not a native Gremlin API based property graph store and it is not ideal for low latency traversals over highly connected operational graphs.

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