Your company wants to implement a data transformation (ETL) pipeline for their BigQuery data warehouse. You need to identify a managed transformation solution that allows users to develop with SQL and JavaScript, has version control, allows for modular code, and has data quality checks. What should you do?

A. Use Dataform to define the transformations in SQLX. B. Use Dataproc to create an Apache Spark cluster and implement the transformations by using PySpark SQL. C. Create a Cloud Composer environment, and orchestrate the transformations by using the BigQueryInsertJob operator. D. Create BigQuery scheduled queries to define the transformations in SQL.