The application must stay private in bothnetwork accessandDNS resolution. Aninternal ALBensures the load balancer is reachable only from within the VPC or connected private networks. ARoute 53 private hosted zoneensures the DNS name is resolvable only from associated VPCs. AWS documentation states that private hosted zones return answers only when queries come from associated VPCs or approved hybrid resolvers, while queries from outside are not resolved from that private zone. A public hosted zone would expose DNS resolution publicly, and an internet-facing ALB would violate the private-access requirement. Therefore, the correct solution isan internal ALB plus a private hosted zone. (AWS Documentation)

EBS Elastic Volumes allow you to dynamically increase storage size, adjust performance, and change volume types without downtime, supporting operational efficiency and scalability for SaaS applications that need to allocate varying storage amounts to customers.
Migrating from EBS to S3 (Option A) is not suitable since S3 is object storage, not block storage, and does not support block-level I/O required by many applications. EFS (Option B) and FSx (Option C) are shared file systems, which might add unnecessary complexity and cost, especially if the application depends on block storage semantics.
Using Lambda to automate Elastic Volumes resizing provides cost efficiency by allocating resources on demand and reduces operational overhead, aligning with AWS operational excellence and cost optimization best practices.
References:
AWS Well-Architected Framework - Operational Excellence and Cost Optimization Pillars (https://d1.
awsstatic.com/whitepapers/architecture/AWS_Well-Architected_Framework.pdf) Amazon EBS Elastic Volumes (https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-expand-volume.
html)
AWS Lambda Overview (https://docs.aws.amazon.com/lambda/latest/dg/welcome.html)

Amazon S3 Intelligent-Tiering automatically moves objects between frequent and infrequent access tiers based on access patterns, which minimizes cost without performance impact. Storing photo metadata in Amazon DynamoDB provides fast and scalable lookup by user or tag.
From AWS Documentation:
"The S3 Intelligent-Tiering storage class automatically optimizes storage costs by moving data between frequent and infrequent access tiers when access patterns change." (Source: Amazon S3 User Guide - Intelligent-Tiering) Why B is correct:
S3 Intelligent-Tiering optimizes storage automatically for cost without lifecycle management overhead.
DynamoDB stores small metadata items and S3 URLs, enabling efficient queries and photo lookups.
This architecture scales globally, integrates seamlessly with applications, and minimizes operational cost.
Why other options are incorrect:
A & D: DynamoDB is not intended for storing binary objects like images.
C: Lifecycle rules are static and don't adapt dynamically to unpredictable access patterns.
References:
Amazon S3 User Guide - "Storage Classes and Intelligent-Tiering"
AWS Well-Architected Framework - Cost Optimization Pillar
AWS Developer Guide - "Building Serverless Image Hosting with S3 and DynamoDB"

The lowest-overhead centralized access model is to connect the existingon-premises Active Directoryby usingAD Connectorand then manage AWS account access throughIAM Identity Center permission sets. AWS documentation explains that IAM Identity Center providesone place to assign permissions to multiple AWS accounts, and AD Connector is specifically designed to let AWS services use an existing directory without storing directory information in AWS. This approach preserves the company's current authentication source and adds centralized authorization across the organization. Creating IAM users or scripting cross-account role assignments would add significant administrative work and weaken the identity model.

This solution meets the requirements of providing encryption at both the network and session layers while also allowing for controlled access between on-premises systems and AWS resources.
AWS Site-to-Site VPN: This service allows you to establish a secure and encrypted connection between your on-premises network and AWS VPC over the internet or via AWS Direct Connect. The VPN encrypts data at the network layer (IPsec) as it travels between the corporate network and AWS.
Routing and Security Controls: By configuring route table entries, you can ensure that only the traffic intended for AWS resources is directed to the VPC. Additionally, by setting up security groups and network ACLs, you can further restrict and control which traffic is allowed to communicate with the instances within your VPC. This approach provides the necessary security to prevent unrestricted access, aligning with the company's security policies.
Why Not Other Options?:
Option A (AWS Direct Connect): While Direct Connect provides a private connection, it does not inherently provide encryption. Additional steps would be required to encrypt traffic, and it doesn't address the session layer encryption.
Option B (IAM policies for Console access): This option does not meet the requirement for network-level encryption and security between the corporate network and the VPC.
Option D (AWS Transit Gateway): Although Transit Gateway can help in managing multiple connections, it doesn't directly provide encryption at the network layer. You would still need to configure a VPN or use other methods for encryption.
AWS References:
AWS Site-to-Site VPN- Overview of AWS Site-to-Site VPN capabilities, including encryption.
Security Groups and Network ACLs- Information on configuring security groups and network ACLs to control traffic.