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Which VPC configuration works while assuring the databa…

You need to design a VPC for a web-application consisting of an Elastic Load Balancer (ELB). A fleet of web/application
servers, and an RDS database. The entire Infrastructure must be distributed over 2 availability zones. Which VPC
configuration works while assuring the database is not available from the Internet?

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A.
One public subnet for ELB one public subnet for the web-servers, and one private subnet for the database

B.
One public subnet for ELB two private subnets for the web-servers, two private subnets for RDS

C.
Two public subnets for ELB two private subnets for the web-servers and two private subnets for RDS

D.
Two public subnets for ELB two public subnets for the web-servers, and two public subnets for RDS

Explanation:
Public subnet ELB talking to private subnet EC2 is confirmed below as well.
https://forums.aws.amazon.com/message.jspa?messageID=528818

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