The correct option is Kusto Query Language.

Kusto Query Language is the native query language for Azure Data Explorer and therefore for Contoso Data Explorer. It was designed for fast ad hoc exploration and time series analytics and it provides a rich set of operators for filtering, summarization, and joins which makes it well suited to data retrieval and analytics workloads.

BigQuery is a Google Cloud product and not the query language used by Contoso Data Explorer. It is a separate data warehouse service that uses its own SQL dialects.

Structured Query Language refers to standard SQL used by many relational systems and it is not the native language for Azure Data Explorer. Azure Data Explorer uses Kusto Query Language rather than standard SQL as its primary query language.

Python SDK is a client library and programming interface that can submit queries and process results but it is not a query language. The Python SDK can be used to run queries written in Kusto Query Language but it does not replace the language itself.

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