AWS Certified Advanced Networking – Specialty ANS-C00 – Question391

Accompany has a public domain, company.com, that is hosted by a DNS provider. The company creates a public hosted zone, cloud.company.com, in Amazon Route 53. The company wants to keep all public AWS application DNS records under this hosted zone.
The company recently deployed its first public application behind an Elastic Load Balancer in its AWS environment. The domain name app1.cloud.company.com needs to access the application.
Which solution will meet these requirements?

A.
On the DNS provider, create A records for cloud under company.com. Point these records to Route 53 name server IP addresses of the public hosted zone. In Route 53, create an ALIAS (A) record for app1 under cloud.company.com. Point this record to the Elastic Load Balancer.
B. On the DNS provider, create a subdomain for cloud under company.com. Create a CNAME record for app1 under cloud.company.com. Point this record to the Elastic Load Balancer public DNS name. In Route 53, create NS records for cloud.company.com. Point these records to the DNS provider name servers.
C. On the DNS provider, create NS records for cloud under company.com. Point these records to Route 53 name servers of the public hosted zone. In Route 53, create an ALIAS (A) record for app1 under cloud.company.com. Point this record to the Elastic Load Balancer.
D. On the DNS provider, create a subdomain for cloud under company.com. Create a CNAME record for app1 under cloud.company.com. Point this record to the Elastic Load Balancer public DNS name. In Route 53, create A records for cloud.company.com. Point these records to the DNS provider name servers.