On September 1,a Firm Grants Credit with Terms of 2/10

On September 1,a firm grants credit with terms of 2/10 net 45.The creditor:

A) must pay a penalty of 2% when payment is made later than September 1st.
B) must pay a penalty of 10% when payment is made later than 2 days after September 1st.
C) receives a discount of 2% when payment is made at least 10 days before September 1st.
D) receives a discount of 2% when payment is made before September 1^st and pays a penalty of 10% if payment is made after September 1st.
E) receives a discount of 2% when payment is made within 10 days after the effective invoice date of September 1st.