Fix: question14 correct answer

Author: danieldanielecki

README.md

@@ -607,8 +607,8 @@ We are so thankful for every contribution, which makes sure we can deliver top-n
 
 - [ ] All at once.
 - [ ] Rolling.
-- [ ] Rolling with additional batch.
-- [x] Immutable.
+- [x] Rolling with additional batch.
+- [ ] Immutable.
 
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