You are a DBA on a Cloud Spanner instance with multiple databases. You need to assign these privileges to all members of the application development team on a specific database:
Can read tables, views, and DDL -
Can write rows to the tables -
Can add columns and indexes -
Cannot drop the database -
What should you do?

A. Assign the Cloud Spanner Database Reader and Cloud Spanner Backup Writer roles. B. Assign the Cloud Spanner Database Admin role. C. Assign the Cloud Spanner Database User role. D. Assign the Cloud Spanner Admin role.