To increase its working capital, Babina Shoes Ltd has boldly printed 1/7, n/30 on all invoices. This means that for all accounts receivables,

a. 1% cash discount may be taken if paid in 7 days; if no cash discount is taken, the full amount is due 30 days after the invoice date.

b. 7% cash discount may be taken if paid in 1 day; if no cash discount is taken, the full amount is due 30 days after the invoice date.

c. 1% cash discount may be taken if paid in 23 days; if no cash discount is taken, the full amount is due in 30 days.

d. 1% cash discount may be taken if paid in 30 days; if no cash discount is taken, the full amount is due 7 days after the end of the month.