Answer – D
The AWS Documentation mentions the following
Mahout is a machine learning library with tools for clustering, classification, and several types of recommenders, including tools to calculate most-similar items or build item recommendations for users. Mahout employs the Hadoop framework to distribute calculations across a cluster, and now includes additional work distribution methods, including Spark.
Option A is incorrect since this is used as an open source, non-relational, distributed database developed as part of the Apache Software Foundation`s Hadoop project
Option B is incorrect since this is used for interaction over a REST interface with an EMR cluster running Spark
Option C is incorrect since this is used as a notebook for interactive data exploration
For more information on Mahout, please refer to the below URL
https://docs.aws.amazon.com/emr/latest/ReleaseGuide/emr-mahout.html