Use Itos Lemma to evaluate dS 2 . For the following four problems, use Itos Lemma to

Use Itˆo’s Lemma to evaluate dS₂.

For the following four problems, use Itˆo’s Lemma to determine the process followed by the specified equation, assuming that S(t) follows 

(a) Arithmetic Brownian motion, equation (20.8); 

(b) A mean reverting process, equation (20.9); and 

(c) Geometric Brownian motion, equation (20.11).