Study the following and pick up the correct statements:
\begin{itemize}
\item[(I)] All the threatened species are listed in red data book
\item[(II)] National parks, Sanctuaries, Biosphere Reserves etc. are some of the methods of ex-situ conservation
\item[(III)] An area which is set aside, minimally disturbed for conservation of the resources of an area is called Biosphere Reserve
\item[(IV)] $\beta$-diversity is measured by counting the number of taxa within a particular area
\end{itemize}