Which role should be assigned to ResearchReviewersGroup1 to allow them to read lakehouse and warehouse data?

Assigning the Viewer role to ResearchReviewersGroup1 is appropriate for allowing them to read lakehouse and warehouse data because the Viewer role is specifically intended for users who need to access data without the capability to modify it. This role provides the necessary permissions to view data, which is essential for research purposes where analysis or oversight is required without the risk of altering the underlying dataset.

The other roles, such as Contributor, Member, and Admin, typically include capabilities that exceed mere viewing. For instance, Contributors can modify data and resources, which isn't suitable for a group that should only be reading data. Members often have more extensive permissions similar to Contributors, and Admins possess full control over the data and environment, including the ability to manage permissions and settings. These roles could introduce a risk of unintended changes to the data or the infrastructure, which is contrary to the objective of simply reviewing the data. Thus, the Viewer role is the most fitting option for the needs of ResearchReviewersGroup1.