Which of the following statements concerning powers of invasion are correct?

I A five-and-five power may be added to a nonmarital trust without the trust assets being includible in the surviving spouses gross estate.

II A five-and-five power may be added to a Q-TIP Trust.

III The surviving spouse may be given the power to invade the entire corpus of a marital trust.

IV The surviving spouse need not be given a power to invade principal under a power of appointment trust.

A. I and II only

B. II and III only

C. III and IV only

D. I, II, III, and IV

Provide a detailed explanation for your answer. ONLY answer if you have a strong estate planning background.