Stock, Quality control and 'Just in time'

Which of the 3 definitions of "Stock" applies to Amazon?

Stock related to amazon

Finished goods are products that have been completed to a satisfactory level of quality and are ready to be sent out to customers.

Amazon might not want to hold stock that could be stolen or become outdated however they could lose money if they don't

2 Main methods of stock alignment

Stock rotation: This is using the oldest stock first

Stock waste : Using newer stock before the old, alllwing waste and costing amazon money instead of bringing them money from sales