[Modify] Answer Correction And Change PDF Buy Link Position

practice-exam/practice-exam-16.md

@@ -879,7 +879,7 @@ 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: ACE
+    Correct Answer: ACD
 
     Explanation:
     <https://aws.amazon.com/blogs/aws/the-new-aws-tco-calculator/>

practice-exam/practice-exam-18.md

@@ -28,7 +28,7 @@ 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: C
+    Correct Answer: D
 
     Explanation: <https://aws.amazon.com/premiumsupport/faqs/>
 
@@ -215,7 +215,7 @@ 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: A
+    Correct Answer: B
 
     Explanation: <https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/ec2-security-groups.html>
 

practice-exam/practice-exam-21.md

@@ -410,8 +410,6 @@ If this practice exam has been helpful to you please share it with others and re
 
     Correct Answer: C
 
-    Explanation: <https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/custom-tags.html#allocation-how>
-
     </details>
 
 30. What is a benefit of consolidated billing for AWS accounts?

practice-exam/practice-exam-23.md

@@ -334,7 +334,7 @@ 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: D
+    Correct Answer: B
 
     Explanation: <https://aws.amazon.com/lambda/security-overview-of-aws-lambda/>