To encourage high adoption rates, the Solution Architect should recommend:

B) Create a feedback loop to give end users the ability to share ideas on how to improve the solution and report bugs. This empowers users to contribute to the solution's success and ensures their needs and challenges are heard.

D) Suggest continuous training methods such as Trailhead, in-app guidance, or embedded videos so end users feel supported using the solution. This provides ongoing support and learning opportunities, making it easier for users to adapt to the new system.

Salesforce Trailhead and the in-app guidance feature are excellent resources for training and user adoption, as recommended by Salesforce's best practices for user engagement and adoption.