DEF Inc. has $2,000,000 available for investment in various projects. The company is evaluating five potential projects with differing capital requirements, NPVs, and IRRs. The opportunity cost of capital is 9 percent. Projects under consideration are: Project Alpha requiring $700,000 with an NPV of $80,000 and an IRR of 11%; Project Beta requiring $600,000 with an NPV of $60,000 and an IRR of 10%; Project Gamma requiring $400,000 with an NPV of -$10,000 and an IRR of 8%; Project Delta requiring $300,000 with an NPV of $50,000 and an IRR of 12%; and Project Epsilon requiring $500,000 with an NPV of $70,000 and an IRR of 13%. Determine which combination of projects should be accepted to maximize the total NPV without exceeding the budget, and discuss the implications of the opportunity cost of capital on the decision.