Find the Discount Date and Net Payment Date

Multiple Choice

Find the discount date and net payment date. (The net payment date is 20 days after the final discount date.)
-Invoice date: Aug 8
Terms:
Goods received: Oct 10

A) Discount date: Sept 15; net payment date: Oct 15
B) Discount date: Oct 25; net payment date: Nov 14
C) Discount date: Oct 25; net payment date: Nov 15
D) Discount date: Oct 15; net payment date: Nov 15