Mixed stream cash flows and annuities differ because:

	a.	mixed streams are inflows and annuities are outflows
	b.	mixed streams follow no particular pattern of cash flows; however, annuities are streams of equal periodic cash flows
	c.	the present value of a mixed stream is easier to calculate than the present value of an annuity
	d.	the future value of a mixed stream is the sum of the future values of the individual cash flows, but the future value of an annuity is simply the future value of the annuity's annual payment
	e.	mixed stream payments occur at the end of each period, whereas annuity payments occur at the beginning of each period