Which publication outlines the Navy's supply policy?

The correct choice identifies NAVSUPINST 4200.99 as the publication that outlines the Navy's supply policy. This instruction serves as a crucial document within the naval supply system, providing guidance and procedures that ensure effective and efficient management of naval supply operations. It details policies regarding the logistics and supply chain processes necessary to support Navy operations and exercises.

In contrast, other options do not specifically address the Navy's overarching supply policy. For example, NAVYINST 4400.01 typically relates to broader logistics support, while NAVSUP 2000.22 may deal with management aspects within the naval supply community. NAVADMIN 600-20 generally covers personnel announcements and administrative directives rather than supply policy. The specificity of NAVSUPINST 4200.99 in addressing supply policy makes it the correct answer for understanding the framework guiding supply management in the Navy.