John needs 40 Eternal Light flashlights by week 6. Each Eternal Light flashlight requires 3 bulbs, and each bulb requires 3 filaments. There are 90 bulbs and 10 filaments in beginning inventory. John ordered an additional 20 bulbs and they are arriving in week 2. The lead time for the flashlights is 2 weeks, the lead time for the bulbs is 2 weeks, and the lead time for the filaments is 1 week. Please prepare:
A. The Product Structure Tree
B. A Material Requirements Plan for the flashlights, bulbs and filaments.