Imagine we have these groups of projects with their financial information, which option is a better candidate for a portfolio. (IRR=25%) O a. NPV= +34,230 , discount rate = 20% NPV= +10,000 , discount rate = 20% O b. NPV= +22,000 , discount rate = 30% NPV= +50,000 , discount rate = 41% O c. NPV= +50,000 , discount rate = 40% NPV= -50,000 , discount rate = 40% O d. NPV= +34,230 , discount rate = 20% NPV= -50,000 , discount rate = 40%