Which policy is associated with critical infrastructure?

The choice of Presidential Policy Directive 21 (PPD 21) as the correct answer is based on its specific focus on the enhancement of the security and resilience of the nation's critical infrastructure. PPD 21 outlines the federal government's strategic approach to securing critical infrastructure assets and recognizes the importance of collaboration among various stakeholders, including government, private sector entities, and state and local organizations.

This directive emphasizes the need for a national effort to manage risks to critical infrastructure, ensuring that these systems are both secure from threats and resilient against failures. It promotes a holistic approach to risk management and establishes essential goals to protect critical infrastructure sectors, making it a cornerstone policy in this field.

In contrast, other options, while related to various aspects of national security and infrastructure protection, do not focus as broadly or comprehensively on critical infrastructure as PPD 21 does. For instance, Executive Order 13636 primarily promotes cybersecurity and protects critical infrastructure through improved cybersecurity practices, but does not comprehensively cover the resilience aspect addressed by PPD 21. The National Infrastructure Protection Plan outlines a strategy for the protection of critical infrastructure but is a more specific operational framework rather than a broad policy directive. Homeland Security Presidential Directive 7 addresses the security of critical infrastructure but predates PPD