Bigtable is a highly scalable, NoSQL database that supports efficient time-to-live (TTL) policies through garbage collection. By configuring a garbage collection policy, you can automatically delete data older than 30 days, ensuring compliance with the company's data retention policy without additional management overhead.
Using Spanner would be less efficient for this use case, as it is a relational database designed for strong consistency, not for simple TTL-based data expiry. Bigtable's TTL feature with garbage collection is optimized for NoSQL data with automated, policy-driven deletions, making it the most efficient choice for your requirements.

A is not correct because the instance group type is not listed as being a problem.
B is not correct because the scenario does not mention autoscaling as being configured.
C Is not correct because using SSH to connect to the instance confirms that the website is running.
D is correct because the instance has been created and the website is being served, but the health check is failing verification.
https://cloud.google.com/compute/docs/instance-groups/creating-groups-of-managed- instances#monitoring_groups

https://cloud.google.com/iap/docs/concepts-overview
IAP lets you establish a central authorization layer for applications accessed by HTTPS, so you can use an application-level access control model instead of relying on network-level firewalls.
IAP policies scale across your organization. You can define access policies centrally and apply them to all of your applications and resources. When you assign a dedicated team to create and enforce policies, you protect your project from incorrect policy definition or implementation in any application.

https://cloud.google.com/kubernetes-engine/docs/concepts/workload-identity Applications running on GKE might need access to Google Cloud APIs such as Compute Engine API, BigQuery Storage API, or Machine Learning APIs.
Workload Identity allows a Kubernetes service account in your GKE cluster to act as an IAM service account. Pods that use the configured Kubernetes service account automatically authenticate as the IAM service account when accessing Google Cloud APIs. Using Workload Identity allows you to assign distinct, fine-grained identities and authorization for each application in your cluster.

https://cloud.google.com/storage/docs/access-control/signed-urls
A signed URL is a URL that provides limited permission and time to make a request. Signed URLs contain authentication information in their query string, allowing users without credentials to perform specific actions on a resource. When you generate a signed URL, you specify a user or service account which must have sufficient permission to make the request that the signed URL will make. After you generate a signed URL, anyone who possesses it can use the signed URL to perform specified actions, such as reading an object, within a specified period of time.