The Notify & Suspend action for a resource monitor in Snowflake sends a notification to all account administrators who have notifications enabled and suspends all assigned warehouses. However, the suspension only occurs after all currently running statements in the warehouses have been completed1. References: [COF-C03] SnowPro Core Certification Exam Study Guide

In Snowflake's data sharing model, any full Snowflake account can both provide and consume shared data.
Additionally, the data consumer pays only for the compute resources used to query the shared data. No actual data is copied or transferred between accounts, and shared data does not take up any storage in a consumer account, so the consumer does not pay for data storage1.
References = Introductionto Secure Data Sharing | Snowflake Documentation

The correct answer is C. Row access policy .
A row access policy is used to implement row-level security in Snowflake. It controls whether a row is visible in query results based on conditions such as the current role, current user, or values in a mapping table.
Why C is correct:
The question asks which feature controls visibility of particular records, meaning rows. Row access policies are designed exactly for that purpose.
Example concept:
CREATE ROW ACCESS POLICY region_policy
AS (region STRING) RETURNS BOOLEAN - >
region IN (
SELECT allowed_region
FROM role_region_mapping
WHERE role_name = CURRENT_ROLE()
);
This policy can allow users with different roles to see only the rows assigned to their region.
Why the other options are incorrect:
A). Dynamic Data Masking controls how column values are displayed. It masks data in columns but does not filter entire rows.
B). Secure Data Sharing allows data to be shared between accounts, but it is not the row-level filtering feature itself.
D). Object tagging classifies or labels objects for governance, but it does not directly control row visibility.
Official Snowflake documentation reference:
Snowflake documentation describes row access policies as schema-level objects that determine whether a row is visible in query results.
Reference: Snowflake Documentation - Row access policies; Snowflake Documentation - Row-level security; SnowPro Core Study Guide - Data Protection and Governance.
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Masking policies in Snowflake are created and applied at the column level. These policies are used to obfuscate sensitive data by masking the values in a specific column. Masking policies can enforce data privacy and protection measures by dynamically masking the data based on the role of the user querying the data.
Snowflake Documentation: Dynamic Data Masking