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AWS Certified Solutions Architect - Associate · AWS
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a is 100% correct.
The keyword is dynamic IPs from the customer, then B, C out, D out due to 0.0.0.0/0
"The application must be secure and accessible for global customers that have dynamic IP addresses." This just means "anyone" so BC are wrong as you cannot know in advance about the dynamic IP addresses. D is just opening the DB to the internet. A is most secure as web is open to internet and db is open to web only.