[Modify] Exam 21 Answer Correction

Update practice-exam-21.md
kananinirav · Feb 5, 2024 · f26a7f2 · f26a7f2
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@@ -142,7 +142,7 @@ If this practice exam has been helpful to you please share it with others and re
 
     <details markdown=1><summary markdown="span">Answer</summary>
 
-    Correct Answer: B
+    Correct Answer: D
 
     Explanation: <https://aws.amazon.com/rds/faqs/>