What are two possible reasons?

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.

Answer: A C