What do the credit terms, $\frac{2}{15},\frac{n}{30},$ mean?

Multiple Choice

A $2\%$ discount can be deducted if the invoice is paid before the $15$ th day following the date of the sa

A $2\%$ discount can be deducted if the invoice is paid after the $15$ th day following the sale, but before

A $2\%$ discount can be deducted for a period up to $30$ days following the date of sale.

A $15\%$ discount can be deducted if the invoice is paid within $2$ days following the date of sale.