How many statements are correct for ecosystem sustainability:

Question

(1) Presence of energy input source
(2) Presence of physical components
(3) Presence of decomposers
(4) Presence of biogeochemical cycle

$\begin{array}{1 1}(a)\;1,2,3\\(b)\;2,3,4\\(c)\;1,2,3,4\\(d)\;1,3,4\end{array} $