フリー問題

問題文

Some high-value parts must be traced by individual unit through the whole flow. What supports tracking a specific unit end to end?

選択肢

1. The scheduling policy, which serializes parts, so a single unit is then followed through transfers.
2. Locations, which track individual units by serial number, so a van then carries the identity of each unit held.
3. Products required, which trace each unit through the transfers and the consumption of it.
4. Serialized products, tracked by serial number so a specific unit is followed through transfers and use.