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How can you implement an automated solution to scale up hardware capacity in Cloud Spanner to handle increased concurrency for a financial services company with growing and occasionally spiking traffic?
A
Use linear scaling to implement the Autoscaler-based architecture
B
Use direct scaling to implement the Autoscaler-based architecture.
C
Upgrade the Cloud Spanner instance on a periodic basis during the scheduled maintenance window.
D
Set up alerts that are triggered when Cloud Spanner utilization metrics breach the threshold, and then schedule an upgrade during the scheduled maintenance window.