A. Purchase a valid wildcard certificate authority (CA) certificate that supports managed renewal. Import this certificate into ACM in Account B.
B. Add NS records for the subdomain dev.example.com to the Route 53 parent zone example.com in Account A.
C. Use AWS Certificate Manager Private Certificate Authority to create a subordinate certificate authority (CA). Use ACM to generate a private certificate that supports managed renewal.
D. Resend the email message that requests ownership validation of dev.example.com.

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