diff --git a/practice-exam/practice-exam-21.md b/practice-exam/practice-exam-21.md
index 66cf519..7252feb 100644
--- a/practice-exam/practice-exam-21.md
+++ b/practice-exam/practice-exam-21.md
@@ -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/>