The most fault-tolerant solution would involve multiple vendors, but Ryan specified that he wanted to work with a single vendor, so this is not an acceptable solution. Therefore, Ryan should strive for the solution that has the greatest geographic and logical redundancy within his vendor’s environment. The best solution would be to use redundant servers in multiple regions. Availability zones are subsets of regions and provide less redundancy, not meeting Ryans architecture needs. Operating servers in the same availability zone would create multiple single points of failure, making it another incorrect answer.