Your application, which makes frequent calls to AWS services using the AWS SDK, has started to experience intermittent failures. Upon inspecting the logs, you observe several instances of an exception being thrown, indicating that the service thinks the request is being sent too quickly. Which of the following exceptions would BEST describe the situation described and requires implementing proper error handling strategies to mitigate the issue?
NoSuchBucketException
ProvisionedThroughputExceededException
ServiceUnavailableException
ValidationException