Answer: Role

In Snowflake's access control model, roles are the only entities that can be organized into a hierarchical structure. This hierarchy allows for role inheritance, where child roles inherit privileges from parent roles, creating a flexible and manageable permission system. The community discussion shows 100% consensus on option B (Role), with comments emphasizing that 'role is hierarchic' and 'Role is correct'. Other options are not hierarchical: A (Securable object) refers to resources that can be secured, C (Privilege) refers to permissions granted, and D (User) refers to individual accounts that are assigned roles but don't form hierarchies themselves.

Author: LeetQuiz Editorial Team