Question Topic: Formation of PMO(project management office)

Dear Friends,

Following questions confused me alot

Question: An organization wants to start a PMO, so how should project manager initiate it,
Choices:
a- Initiate PMO as seperate project
b- Simply form a PMO unit
c- Form PMO itself and co ordinate different project by providing guidelines, standards, shared resources
d- Hire a consultant who can define the PMO model

Your early reply to this question will be appreciated, thanks in advance.
Regards,

Jonathan.