Your company has a bucket that has versioning and Encryption enabled.The bucket receives thousands of PUT operations per day. After 6 months, there are a significant number of HTTP 503 error codes that are being received. Which of the following can be used to diagnose the error?

Answer options:

A.AWS Config
B.AWS Cloudtrail
C.AWS S3 Inventory
D.AWS Trusted Advisor

Answer – C
The AWS Documentation mentions the following.
If you notice a significant increase in the number of HTTP 503-slow down responses received for Amazon S3 PUT or DELETE object requests to a bucket that has versioning enabled, you might have one or more objects in the bucket for which there are millions of versions. When you have objects with millions of versions, Amazon S3 automatically throttles requests to the bucket to protect the customer from an excessive amount of request traffic, which could potentially impede other requests made to the same bucket.
To determine which S3 objects have millions of versions, use the Amazon S3 inventory tool. The inventory tool generates a report that provides a flat file list of the objects in a bucket.
Option A is incorrect since this tool is used to monitor configuration changes.
Option B is incorrect since this tool is used to monitor API activity.
Option D is incorrect since this tool is used to give recommendations.
For more information on troubleshooting, please refer to the below URL-
https://docs.aws.amazon.com/AmazonS3/latest/dev/troubleshooting.html