Answer: Privilege

The question asks for the Snowflake access control concept defined as a 'defined level of access to an object' or 'specific level of access granted on a securable object.' According to Snowflake documentation and the community discussion (with 100% consensus and upvoted comments referencing official docs), a 'Privilege' is precisely this concept - it represents granular permissions like SELECT, INSERT, UPDATE, etc., that can be granted on objects. 'Grant' (A) is the action of assigning privileges, not the concept itself. 'Role' (C) is a collection of privileges that can be assigned to users. 'Session' (D) is unrelated to access control concepts for object permissions.

Author: LeetQuiz Editorial Team