フリー問題

問題文

The same city office wants to be able to fail one view over to the second site. Which pair states the condition that has to be satisfied beforehand, and what the operator still has to change for the clients?

選択肢

1. In that configuration the failover step only works when the earlier seeding already ran before the incident and the operator still redirects the name lookup of every client.
2. In that configuration the failover step only works when the earlier seeding already ran before the incident and the operator still redirects the name netmask of every client.
3. In that configuration the failover step only works when the earlier drill already ran before the incident and the operator still redirects the name netmask of every client.
4. In that configuration the failover step only works when the earlier drill already ran before the incident and the operator still redirects the name lookup of every client.