Which statement is false about shipment cost?
A. Cost Fixed check box at shipment indicates that the cost for this entire shipment is fixed.
B. Rate Record Fixed check box at shipment indicates that the rate record for this shipment is fixed and cannot be changed.
C. Rate Offering Fixed check box at shipment indicates that the rate offering for this shipment is fixed.
D. Planned cost field can be changed by any shipment modifications that may affect the cost.