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How should you assign Identity and Access Management (IAM) permissions to a new application that reads from an existing Cloud Spanner database for dashboard statistics, following Google's best practices?
A
Reuse the existing service account that populates this database.
B
Create a new service account, and grant it the Cloud Spanner Database Admin role.
C
Create a new service account, and grant it the Cloud Spanner Database Reader role.
D
Create a new service account, and grant it the spanner.databases.select permission.
