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You have data stored in both Cloud Storage and BigQuery datasets within Google Cloud Platform. Your goal is to secure this data by implementing three distinct access levels: administrator, read/write, and read-only, adhering to Google's recommended practices. What is the best approach to achieve this?
A
At the Project level, assign your administrator user accounts to the Owner role, read/write user accounts to the Editor role, and read-only user accounts to the Viewer role.
B
Utilize the predefined IAM roles for each required access level in Cloud Storage and BigQuery, assigning users to these roles accordingly.
C
At the Organization level, allocate administrator user accounts to the Owner role, read/write user accounts to the Editor role, and read-only user accounts to the Viewer role.
D
Develop three custom IAM roles with tailored policies for the necessary access levels in Cloud Storage and BigQuery, then assign users to these roles.