stock_eu and stock_us are two replicas of the same stock data. In a real system they are on two machines. Here you play the network yourself.

1. Sell one Kraken Plush (product 1) in Europe: take 1 from its stock in stock_eu only.
2. A customer in the US reads the stock of product 1 from stock_us. What does the read return?
3. The change reaches the US. Run the replication job, which copies every stock value from the EU replica to the US replica:

UPDATE stock_us u
SET stock = (SELECT e.stock FROM stock_eu e WHERE e.product_id = u.product_id);

4. In step 2, the US replica answered with old data instead of an error. Which CAP property did it keep?
5. After step 3, both replicas were the same again, without new writes. What is this called? Give the two words.
6. During a partition, a bank's replica refuses every withdrawal until it can reach the others. Which CAP property does the bank keep?