To answer this question, you need to be familiar with the different Amazon Web Services (AWS) cloud products and recent events related to AWS.
Option A) SimpleDB - This option is incorrect because SimpleDB is a NoSQL database service offered by AWS, and there have been no recent reports of a massive outage related to SimpleDB.
Option B) EBS - This option is correct because Elastic Block Store (EBS) is a block storage service provided by AWS, and it recently experienced a massive outage on June 8, 2021. This outage affected multiple AWS regions and resulted in service disruptions for many customers.
Option C) S3 - This option is incorrect because Amazon Simple Storage Service (S3) is a scalable object storage service provided by AWS, and there have been no recent reports of a massive outage related to S3.
Option D) CloudFront - This option is incorrect because Amazon CloudFront is a content delivery network (CDN) service provided by AWS, and there have been no recent reports of a massive outage related to CloudFront.
The correct answer is B) EBS. This option is correct because EBS recently experienced a massive outage that had a significant impact on AWS customers.