Which solution component helps to achieve rapid migration to the cloud for SaaS and public...

B (Cloud OnRamp):Cloud OnRamp extends SD-WAN capabilities to optimize SaaS and IaaS connectivity, offering dynamic path selection, performance monitoring, and improved user experience when migrating to cloud services.

Other options explained:

A: Describes general cloud architecture, not an SD-WAN feature.

C: Cloud registry is not an SD-WAN feature.

D: Microservices are an application architecture, not a WAN migration tool.