What is the MOST operationally efficient solution that meets these requirements?

A company hosts an online shopping portal in the AWS Cloud. The portal provides HTTPS security by using a TLS certificateon an Elastic Load Balancer (ELB).
Recently, the portal suffered an outage because the TLS certificate expired. A SysOpsadministrator must create a solution to automatically renew certificates to avoid this issue in the future.
What is the MOST operationally efficient solution that meets these requirements?
A. Request a public certificate by using AWS Certificate Manager (ACM). Associate the certificate from ACM with the ELB.
Write a scheduled AWS Lambda function to renew the certificate every 18 months.
B. Request a public certificate by using AWS Certificate Manager (ACM). Associate the certificate from ACM with the ELACM will automatically manage the renewal of the certificate.
C. Register a certificate with a third-party certificate authority (CA). Import this certificate into AWS Certificate Manager (ACM). Associate the certificate from ACM with the ELB. ACM will automatically manage the renewal of the certificate.
D. Register a certificate with a third-party certificate authority (CA). Configure the ELB to import the certificate directly from the CA. Set the certificate refresh cycle on the ELB to refresh when the certificate is within 3 months of the expiration date.