Answer - A and B.
This is mentioned in the AWS Documentation.
An HTTP 400 status code indicates a problem with your request, such as authentication failure, missing required parameters, or exceeding a table's provisioned throughput.
You will have to fix the issue in your application before submitting the request again.
Options C and D are incorrect since these would result in 5xx errors.
For more information on programming errors in DynamoDB, please visit the following URL-
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Programming.Errors.html
The HTTP 4xx status codes are client error responses, indicating that the request made by the client is incorrect or invalid. Therefore, the possible issues with the requests returning these error codes could be:
A. There are missing required parameters with some of the requests: Some of the requests may not include all the necessary parameters required by the DynamoDB API. For example, if you are trying to write an item to a DynamoDB table, you need to provide the primary key attribute values for the table. If any of the required parameters are missing, DynamoDB will return an HTTP 4xx status code, such as a 400 Bad Request error.
B. You are exceeding the table's provisioned throughput: DynamoDB has a provisioned throughput system where you define the read and write capacity units required for your table. If you exceed the provisioned throughput, DynamoDB will return an HTTP 4xx status code, such as a 400 Bad Request error, indicating that the request rate is too high.
C. The DynamoDB service is unavailable: If the DynamoDB service is unavailable, you will receive an HTTP 5xx status code, indicating that there is a server-side error.
D. There are network issues: If there are network issues, such as timeouts or connectivity problems, you may receive an HTTP 4xx status code indicating that the request could not be completed due to communication errors.
Therefore, options C and D are not correct answers to this question, as they are not related to the client-side errors returned by HTTP 4xx status codes. The correct answers are A and B, as they represent the possible issues that could cause these types of errors when working with a DynamoDB table.
