Are the following statements true or false?

An investment is beneficial......

a) if the sum of all discounted deposits is greater than the sum of all discounted withdrawals,

b) if the discount rate is below the internal rate of return,

c) if this investment generates a return that is as high as the return on the alternative investment,

d) if the deposits do not cover the investment-related payments and the expected interest

e) if their payback period is less than the maximum acceptable