Which AWS services can host PostgreSQL databases? (Choose two.)
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Correct answer: Amazon Aurora, Amazon EC2.
Why this is the answer
Amazon Aurora is a fully managed relational database service compatible with PostgreSQL, offering high performance and availability. Amazon EC2 allows you to provision virtual servers and install PostgreSQL directly, giving you complete control over the database environment. Amazon S3 is object storage, not a database service. Amazon OpenSearch Service is for search and analytics, not a relational database. Amazon EFS is a scalable file storage service, not a database hosting solution itself, though it could potentially be used for database backups or shared storage in a custom EC2 setup.
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