Reading tiers A–D and "x/y"

Tiers come from published rules applied to sourced facts; nobody types them in. A: meets every criterion. B: fails none, but does not meet them all, or a new incident awaits review. C: fails at least one. D: an active incident that may affect deposits right now; it lifts when the incident ends.

The number next to the letter counts the criteria met out of the total: two venues in the same tier can still differ. No tier, not even A, means risk-free.