To enhance both the performance and resilience of the website, the best approach involves using Amazon EFS for shared storage and setting up an AMI-based Auto Scaling group. Option C (Utilize Amazon EFS for storing website images) ensures that all EC2 instances can access the same set of images, providing both scalability and reliability. Option D (Deploy an AMI-based Auto Scaling group with a minimum of two instances behind an Application Load Balancer) introduces redundancy and load balancing, which further improve the website's resilience and availability. These combined actions make the website more robust and capable of handling higher traffic loads.