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In a VPC with a two-tier web application, the web tier on public subnets and the private database tier are unable to communicate despite correct configurations. What action should a solutions architect take to resolve the connectivity issue?
A
Modify the private subnet's network ACL to permit traffic from the web tier's EC2 instances.
B
Update the VPC route table for traffic between the web and database tiers.
C
Place the web and database tiers in separate VPCs and set up VPC peering.
D
Adjust the database tier's RDS security group to accept traffic from the web tier's security group.
