[A] Negative Stock Restriction prevents the stock from going into negative.
[C} If enabled, the negative stock restriction will prevent you from engaging in any activities such as production, stock transfer, etc. that may lead to negative quantity in the store.
[D] Stock Transfer Restriction will not let you transfer stock from the store if there is an insufficient quantity and stock may run into negative. Document Restriction will not let you save and Send the document creating the document will lead to negative stock.
[E] Manual Adjustment Restriction will prevent you from manually adjusting stock levels if they are falling to below zero. Production Restriction will prevent the use of raw materials if their consumption will decrease their quantity to below zero.
[F] Approval Restriction prevents you from approving documents which leads to stock being negative. Physical Stock Reconciliation (PSR) restriction prevents you from doing a PSR that leads to negative stock.