A supplier's invoice to a retailer includes the statement $"5\%15$ net $45".$ What does this statement imply?

Select the single best answer:

$$ A$.$ The retailer has $45$ days to pay the invoice in full.

$$ B$.$ The retailer will receive a $5\%$ discount if the invoice is paid within $15$ days. The retailer has $45$ days to pay the invoice in full.

$$ C$.$ The retailer must pay $5\%$ of the invoice within $15$ days.

$$ D$.$ The retailer will be charged an additional $5\%$ if the invoice is not paid within $15$ days.

$$ E$.$ The retailer has $5$ days to pay the invoice to receive a $15\%$ discount.