In a comment thread, a reader sees a reply before the question it answers. What is the weakest guarantee that rules this out?

Options

• ✗ Linearizability
• ✓ Causal consistency Correct
• ✗ Read-your-writes
• ✗ Eventual consistency

Why

Causal consistency guarantees that if one write depends on another, everyone sees them in that order. Linearizability also prevents it but costs much more; read-your-writes only covers your own writes, and eventual consistency allows any order for a while.

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