Kendall Is the New Owner of a Catering Company

Kendall is the new owner of a catering company.She receives an invoice for a new walk-in refrigerator which mentions "2/10,n/30." Which of the following statements best explains this?

A) She can earn a ten percent discount if she pays within two days of receiving the bill; otherwise it is due at the end of the month.
B) She can earn a twenty percent discount if she pays within ten days of receiving the bill; otherwise it is due at the end of the month.
C) She can earn a two percent discount if she pays within ten days of the invoice date; otherwise the full amount is due in thirty days.
D) She can earn a thirty percent discount if she pays within two days of receiving the bill, or a ten percent discount if she pays by the end of the month.
E) She can earn a ten percent discount if she pays within two days of receiving the bill; she will pay a ten percent penalty if it is not paid within thirty days.