Your company has only 10 specialised engineers to work on multiple and simultaneous building projects. You are considering the following 4 projects: Project 1 has an NPV of $4 million and requires 4 engineers Project 2 has an NPV of $5 million and requires 6 engineers Project 3 has an NPV of $6 million and requires 4 engineers Project 4 has an NPV of $7 million and requires 6 engineers Given your constraints of 10 engineers which projects would you accept and why?