Chaos thru period doubling

Hi,

Im on something that associates with period doubling bifurcation and wanted to know:

The idea of a system that demonstrates pdb, is that the period-time doubles as a function of some parameter (call it $\displaystyle p$), until the length of a single period reaches "infinity".

Bascially, if I double a period-time which was initially finite, i will always get a finite time, and so in-order to reach an infinite period, the system needs to undergo infinite amount of bifurcations.

My question is- which one of these options is correct for pdb:

(a) Is there a certain finite value, before-which the system has an inifinite amount of bifurcations? or-

(b) For every sampling resolution R, there exists a *finite* value of the parameter $\displaystyle p=p_0$ , such that the period that is measured in resolution R is "infinite" ?

Thanks