The comparative advantage argument for the popularity of interest rate swaps assumes that

	a.	firms with stronger credit rating have a comparative advantage in the fixed-rate market and buy swaps to pay the net floating rate
	b.	firms with poor credit rating have a comparative advantage in the floating-rate market and sell swaps to pay a net fixed rate
	c.	firms with poor credit rating have a comparative advantage borrowing in the floating-rate market and buy swaps to pay a net fixed rate
	d.	firms with stronger credit rating have a comparative advantage in the floating-rate market and buy swaps to pay a net fixed rate