Which AWS resource provides example cloud solution architectures and reference designs?

The AWS Architecture Center is the correct answer because it provides a comprehensive collection of reference architectures, design patterns, and best practices for building solutions on AWS. It includes whitepapers, solution briefs, and well-architected frameworks that guide users in designing secure, high-performing, resilient, and efficient cloud applications. AWS Marketplace is incorrect because it is a digital catalog where customers can find, buy, and deploy third-party software, not architectural guidance. AWS Service Catalog allows organizations to create and manage catalogs of IT services approved for use on AWS, which is different from providing architectural examples. AWS Trusted Advisor is a service that inspects your AWS environment and provides recommendations for cost optimization, performance, security, fault tolerance, and service limits, not architectural designs.