You need to determine why CustomerX is unable to confirm another sales order.

You need to determine why CustomerX is unable to confirm another sales order.
What are two possible reasons? Each answer is a complete solution.
NOTE: Each correct selection is worth one point.
A. The credit limit parameter is set to Balance + All.
B. The credit limit is set to 0.
C. An inventory item is out of stock.
D. The inventory safety stock is set to 0.