How should a solutions architect optimize high availability for the application?
Use Lambda@Edge for CloudFront.
Use Amazon S3 Transfer Acceleration for CloudFront.
Configure another EC2 instance in a different Availability Zone as part of the origin group.
Configure another EC2 instance as part of the origin server cluster in the same Availability Zone.
Explanations:
While Lambda@Edge can enhance performance by running code closer to users, it does not directly contribute to high availability of the EC2 instance as the origin.
Amazon S3 Transfer Acceleration optimizes data transfer to S3, but does not relate to the high availability of EC2 instances as origins for CloudFront.
Configuring another EC2 instance in a different Availability Zone provides redundancy and failover capabilities, which enhances high availability for the application.
Configuring another EC2 instance in the same Availability Zone does not improve high availability, as both instances could be affected by the same failure in that zone.