A developer is building a new application that needs to store frequently accessed, semi-structured data. The application requires high read and write throughput, low latency, and automatic scaling without needing to provision servers. The data model is flexible and does not require strong transactional consistency across multiple tables. Which Google Cloud database is the most appropriate choice?

Why the other options are wrong

• B. Cloud SQL is a relational database and requires a structured schema, which is not suitable for 'semi-structured data' and 'flexible data model'. It also requires some provisioning and scaling management.
• C. Cloud Spanner is a globally distributed, strongly consistent, relational database. While it offers high performance and scaling, it's designed for strong transactional consistency and structured data, making it overkill and less flexible for 'semi-structured data' with 'flexible data model' that doesn't need multi-table strong consistency.
• D. BigQuery is a serverless data warehouse optimized for analytical queries on massive datasets, not an operational database for frequently accessed, low-latency, transactional operations for an application.