Answer: External tokenization

The question asks for a feature of column-level security in Snowflake. According to Snowflake's official documentation and the community discussion, column-level security includes two main features: Dynamic Data Masking and External Tokenization. External Tokenization (option D) is explicitly mentioned in the documentation link provided by multiple commenters, with the highest upvotes supporting this answer. Internal Tokenization (option C) is not a Snowflake column-level security feature, as clarified by the community discussion where a user initially selected C but corrected to D. Role access policies (A) and Network policies (B) are related to different security aspects in Snowflake but are not specific features of column-level security.

Author: LeetQuiz Editorial Team