Amazon EMR

Correct Answer: To develop custom applications and tools for Amazon EMR

The AWS SDK for Java provides Java libraries that let developers programmatically call Amazon EMR APIs with authenticated requests. This enables building custom applications and tools that create and manage clusters, submit and track steps, and integrate EMR operations into workflows. The SDK itself is not a monitoring product or a security service; monitoring is handled via services like Amazon CloudWatch, and security via IAM and networking. While you can automate EMR through code written with the SDK, that automation is a result of application development using the SDK.

Correct Answer: A web service for processing big data using frameworks like Apache Hadoop, Apache Spark, and Presto

Amazon EMR is a managed cluster platform that simplifies running big data frameworks, such as Apache Hadoop and Apache Spark, on AWS to process and analyze vast amounts of data. Hence, option 1 is the correct answer.

Correct Answer: To specify the version of Hadoop and other applications to be installed on the cluster.

The EMR Release Label is used to specify the version of Hadoop and other applications to be installed on the cluster. This ensures that the correct version of software is used and there are no compatibility issues between different applications.