Let me tell you that if A invests in B's technology, then it must first check whether B's technology is a patented technology. If so, then it will be evaluated. If the skills are average, then it depends on the two of you. Generally speaking, you can use him with a high salary and give him appropriate shares at the end of the year. I think C should be the same as B, which is the best. As for D, that's the main thing. Then he will definitely be given shares. The amount given depends on how much of his investment it is? Technology also depends on his and B.C's technology? As for capital investment, it depends on how much of the company's shares he holds. This is my suggestion. The main thing is that D should have shares, and the rest is just technology. There are many technical talents now, so B.C can pay high wages. If you feel uncomfortable, then give him a big bonus at the end of the year.