Which query languages should the engineer use to develop graph applications on Amazon Neptune? (Choose two.)

Amazon Neptune supports two primary graph query languages: Gremlin and SPARQL. Gremlin is a graph traversal language used for property graphs, allowing you to traverse and manipulate graph data. SPARQL is a W3C standard query language for RDF (Resource Description Framework) graphs, designed for querying linked data. SQL, ANSI SQL, and Spark SQL are relational database query languages and are not directly supported by Amazon Neptune for graph data querying. While you might use SQL-based tools for data preparation before loading into Neptune, the actual querying of the graph database requires Gremlin or SPARQL.