A . Elastic MapReduce (EMR) is Facebook's packaged Hadoop offering
B . Amazon Web Service Elastic MapReduce (EMR) is Amazon's packaged Hadoop offering
C . Scalding is a Scala API on top of Cascading that removes most Java boilerplate
D . All of the mentioned
Answer: Option A
Rather than building Hadoop deployments manually on EC2 (Elastic Compute Cloud) clusters, users can spin up fully configured Hadoop installations using simple invocation commands, either through the AWS Web Console or through command-line tools.
