Consider the following cash flows: C$0$ C$1$ C$2$ C$3$ C$4$$$45+$$ $41+$$ $41+$$ $41$$$82$ a$.$ Which two of the following rates are the IRRs of this project? b$.,$ c$.,$ and d$.$ What is project NPV if the discount rates are $4\%,21\%,$ and $41\%?$ b$.$discount rate $4\%$ c$.$discount rate $21\%$ d$.$discount rate $41\%$