A company uploads large files to S3 with multipart upload. Some clients disconnect permanently before completing their uploads. Storage charges continue to grow even though the unfinished files do not appear as completed objects. Which bucket configuration best addresses the abandoned parts?

1. An S3 lifecycle rule that aborts incomplete multipart uploads after an appropriate number of days.
2. An expiration rule for completed objects only, with no multipart-abort action.
3. A CloudFront invalidation after every failed upload.
4. S3 Versioning alone, which automatically completes abandoned uploads into billable object versions.