Your question depends on whether it is commodity futures or stock index futures. If it is commodity futures, it is B. If it is stock index futures, it is A. You can look at stock index futures and other commodity futures in the market software. Just know the difference. The buyer buys 4 long lots and the seller sells 4 short lots. In commodity futures, this is counted as 8 lots. In stock index futures, it is current position 4. Exchange regulations are just different.