AWS Service Options

Correct Answer - B.

Amazon DynamoDB Accelerator (DAX) is a caching service for DynamoDB which can be deployed in VPC in a region where DynamoDB is deployed.

For read-heavy applications, DAX can be deployed to increase throughput by providing in-memory caching.

Option A is incorrect because Amazon Route 53 is an AWS DNS service and cannot improve the performance of DynamoDB.Option C is incorrect because Amazon CloudFront is a global content delivery network that cannot be applied to a DynamoDB table.

Option D is incorrect because AWS Greengrass is data caching software for connected devices.

For more information on caching solutions with AWS, refer to the following URL:

The AWS service that can be deployed to enhance read performance for applications while reading data from NoSQL database is Amazon DynamoDB Accelerator, also known as DynamoDB Accelerator or DAX.

DynamoDB is a NoSQL database service provided by AWS, which provides fast and flexible querying capabilities with high scalability and performance. However, as the data volume grows, it may take longer to fetch the data and read operations may suffer from latency issues.

DynamoDB Accelerator (DAX) is an in-memory cache that sits between the application and DynamoDB database, enabling fast, predictable, and consistent performance for read-intensive applications. DAX caches frequently accessed data in memory, thereby reducing the number of read requests to the DynamoDB database.

DAX is fully managed by AWS and is compatible with DynamoDB API, which means that applications can use the same API calls as they would with DynamoDB, but with improved performance. DAX is also highly available and can be deployed in multiple availability zones to ensure business continuity and disaster recovery.

Therefore, the correct answer is B. Amazon DynamoDB Accelerator. The other options mentioned in the question are not related to enhancing read performance for applications while reading data from NoSQL database.

Amazon Route 53 is a highly available and scalable DNS service that can be used to route traffic to different AWS services, including DynamoDB, but it does not directly enhance read performance.

Amazon CloudFront is a content delivery network (CDN) that can be used to cache and distribute content globally, including static and dynamic content from web applications, but it is not designed to improve read performance of NoSQL databases.

AWS Greengrass is a software that extends AWS cloud capabilities to local devices and helps to process and analyze data at the edge, but it is not related to enhancing read performance for applications while reading data from NoSQL database.