The question focuses on encrypting payment information between the customer's browser and GCP services during checkout, which involves HTTPS traffic (HTTP over SSL/TLS). Option A is correct because an L7 (Application Layer) Load Balancer with an SSL certificate is designed to handle HTTPS traffic, terminate SSL/TLS at the load balancer, and enforce encryption, aligning with best practices for securing web applications. The community discussion unanimously supports A (100% consensus), emphasizing that L7 load balancers are appropriate for HTTP/HTTPS traffic. Option B is less suitable as Network TCP Load Balancers (L4) operate at the transport layer and do not natively handle SSL termination or HTTP-specific features. Option C is incorrect because merely allowing inbound port 443 traffic does not enforce encryption or SSL certificate configuration. Option D is irrelevant as it addresses outbound traffic, which does not secure the inbound customer connection.