What is required before publicly listing an app on the Slack Marketplace?

Slack Marketplace publication is not automatic. Applications must satisfy Slack's Marketplace guidelines and pass Slack's submission and review process. Slack evaluates areas including functionality, installation and OAuth behavior, user experience, requested scopes, security controls, privacy documentation, support readiness, and application quality. As of September 2026, Slack also requires new Marketplace submissions to maintain at least 10 installations on active workspaces throughout review, subject to stated exceptions such as qualifying security and compliance partners. However, installation count alone does not qualify an application for publication; the complete Marketplace review requirements still apply. Enterprise Grid is likewise not required merely to publish an app. Therefore, B is the comprehensive correct answer because it encompasses Slack's review, eligibility, security, quality, distribution, and current submission requirements.