If an entrepreneur decides to go the initial public offering $($IPO$)$ route, can they cash out of the business and walk away?

a$.$ No$,$ they likely cannot cash out for some time.

b$.$ Yes, they can cash out and walk away within $90$ days.

c$.$ No$,$ they can never cash out and walk away.

d$.$ Yes, they can cash out and walk away in approximately six months.