Answer: Network policy

The question specifically asks about preventing unauthorized access from an unknown IP address. Network policies (A) are the most direct and effective solution for this scenario as they explicitly control which IP addresses can access Snowflake. While MFA (C) provides strong authentication security, it doesn't specifically address IP-based access control - an attacker with valid credentials could still access from unauthorized IPs if network policies aren't in place. RBAC (D) manages user permissions but doesn't control network access. End-to-end encryption (B) protects data in transit but doesn't prevent unauthorized connections. The community discussion shows consensus around network policies for IP-based access control, with some acknowledging MFA's value but recognizing network policies as the primary solution for unknown IP addresses.

Author: LeetQuiz Editorial Team