Which version of this story best demonstrates Insist on the Highest Standards with clear ownership, scope boundary, and quantification?

Which version of this story best demonstrates Insist on the Highest Standards with clear ownership, scope boundary, and quantification? Version 1: "I was working on the checkout flow and noticed a bug causing payment failures. I escalated the issue to the payments team. They fixed it, and the problem was resolved." Version 2: "We noticed payment failures during checkout and investigated as a team. We found the root cause and deployed a fix. Customer complaints dropped significantly." Version 3: "I found a payment bug outside my team and decided to fix it myself. I traced the root cause and deployed a patch. Things improved after the fix." Version 4: "During a routine review, I spotted a 0.5% payment failure rate in checkout -- not my team, no ticket. I traced the race condition, wrote a fix, and coordinated rollout with Payments. The failure rate dropped to zero, protecting $10K/week in revenue."