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Answer: Verify domain ownership with Webmaster Central. Create a DNS CNAME record to point to the App Engine canonical name ghs.googlehosted.com.
To make an App Engine service accessible via a custom domain like www.altostrat.com, you must verify domain ownership through Google Webmaster Central. For subdomains (www), a CNAME record pointing to ghs.googlehosted.com is required, as App Engine does not recommend static IPs (A records) due to potential changes. Dispatch.yaml is unnecessary here since the question specifies a single website/service, eliminating the need for routing configuration. Options B and D incorrectly suggest using an A record, while C and D include dispatch.yaml, which is not required for a single service.
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How should you configure a single website deployment on App Engine to ensure it is accessible via the custom domain http://www.altostrat.com/?
A
Verify domain ownership with Webmaster Central. Create a DNS CNAME record to point to the App Engine canonical name ghs.googlehosted.com.
B
Verify domain ownership with Webmaster Central. Define an A record pointing to the single global App Engine IP address.
C
Define a mapping in dispatch.yaml to point the domain www.altostrat.com to your App Engine service. Create a DNS CNAME record to point to the App Engine canonical name ghs.googlehosted.com.
D
Define a mapping in dispatch.yaml to point the domain www.altostrat.com to your App Engine service. Define an A record pointing to the single global App Engine IP address.