You Need to Design a VPC for a Web-Application Consisting

Multiple Choice

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?

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