TI-API: Questions Regarding TI Product Information Suite API Response Fields​

Tool/software:

We have several questions about the field information returned in the TI Product Information Suite API responses and would appreciate your clarification:

1. ​​changeOrderWindow field:​​ It has four possible values: CST, NON, SMC, and STD. What does each one represent?
2. ​​lifeCycleStatus field:​​ This indicates the product's lifecycle status. What does PREVIEW specifically mean?
3. Among the three fields ​​lifetimeBuy​​, ​​okayToOrder​​, and ​​stopShip​​, which field is the definitive indicator for determining whether a material/part can be ordered?
4. ​​militaryGoods:​​ This indicates if the product is designated for use in military applications. Are materials where this result is true orderable in mainland China? (Note: This question inherently touches upon export/import regulations).
5. ​​price field quantity attribute:​​ The quantity values associated with pricing tiers seem restricted to only 100 or 1000. Additionally, when quantity=1000, the price often corresponds to a minOrderQty value that differs significantly from 1000. Why is there this discrepancy?
6. Part number comparison: What is the distinction between ​​THS3120CDGN.A​​ and ​​THS3120CDGN​​? Furthermore, the price for 1000 pieces of THS3120CDGN is listed as 6.29 (USD, presumably), while 1000 pieces of THS3120CDGN.A are priced at 7.2335. What causes this price difference?
7. ​​nextIncrementQty:​​ Why is this field sometimes null or empty for certain parts?
8. ​​inventoryStatus field:​​ The value returned is "Supported by TI store inventory and pricing API". What is the meaning or implication of this status?

Thank you for your time and clarification on these points.