What is:

$($a$)$ a basic Wiener process?

$($b$)$ the difference between a basic Wiener process and a

generalised Wiener process?

$($c$)$What is an Ito process? Why is an Ito process more applicable to

describing the stochastic process of asset prices than a basic

Wiener process or the gener$-$ alised Wiener process? Briefly

explain the limitations of this process given the empirical

observations of asset returns.