Correct answers - "The invocation was asynchronous & The invocation failed" : Any Lambda
function invoked asynchronously is retried twice before the event is discarded. If the retries
fail and you're unsure why, use Dead Letter Queues (DLQ) to direct unprocessed events to an
Amazon SQS queue.
"The invocation was synchronous" - Any Lambda function invoked asynchronously is retried twice
before the event is discarded
"The invocation succeeded" - The initial invocations have to fail that's what tells us there is
something wrong
"The invocation failed only once but succeeded afterwards" - It would have to fail twice before
using SQS DLQ