Your company implemented BigQuery as an enterprise data warehouse. Users from multiple business units run queries on this data warehouse. However, you notice that query costs for BigQuery are very high, and you need to control costs. Which two methods should you use?
(Choose two.)

Your organization is a financial company that needs to store audit log files for 3 years. Your organization has hundreds of Google Cloud projects. You need to implement a cost-effective approach for log file retention.
What should you do?

You're working for a company as a Cloud engineer. You have a managed instance group for which the autoscaling is enabled if CPU utilization is 70%. Right now there are 4 instances available in this instance group. When you connect to one of the instance, you see that the CPU utilization is 75% and there is no new instance is started in the group. What could be the possible reason for not starting another instance here?

You have just created a new project which will be used to deploy a globally distributed application. You will use Cloud Spanner for data storage. You want to create a Cloud Spanner instance. You want to perform the first step in preparation of creating the instance. What should you do?

2. Your auditor wants to view your organization's use of data in Google Cloud. The auditor is most interested in auditing who accessed data in Cloud Storage buckets. You need to help the auditor access the data they need. What should you do?