Answer: External tokenization

The question asks which feature is supported in column-level security in Snowflake. According to Snowflake documentation, column-level security includes two main features: Dynamic Data Masking and External Tokenization. External Tokenization (option C) is explicitly listed as one of these supported features. While Tag-based masking policies (option D) leverage column-level security capabilities, they are an implementation method that builds upon the core column-level security features rather than being a fundamental supported feature themselves. The community discussion shows divided opinions, but the official documentation clearly identifies External Tokenization as a core column-level security feature. Object tagging (A) and Data classification (B) are separate security features that are not specifically part of column-level security.

Author: LeetQuiz Editorial Team