You Are Running a Data Warehouse on BigQuery

You are running a data warehouse on BigQuery. A partner company is offering a recommendation engine based on the data in your data warehouse. The partner company is also running their application on Google Cloud. They manage the resources in their own project, but they need access to the BigQuery dataset in your project. You want to provide the partner company with access to the dataset. What should you do?

A) Create a Service Account in your own project, and grant this Service Account access to BigQuery in your project.
B) Create a Service Account in your own project, and ask the partner to grant this Service Account access to BigQuery in their project.
C) Ask the partner to create a Service Account in their project, and have them give the Service Account access to BigQuery in their project.
D) Ask the partner to create a Service Account in their project, and grant their Service Account access to the BigQuery dataset in your project.