Under the Australian Consumer Law,if Goods Are Displayed with Two

Under the Australian Consumer Law,if goods are displayed with two prices the supplier:

A) has the right to impose the higher price if the words "No Rainchecks" or their equivalent are displayed at the point of sale.
B) must supply the goods at the lowest of the two prices.
C) has the right to impose the higher price if the GST for each price is clearly displayed at the same time.
D) must supply the goods for the difference between the two prices.