Digital signals (i) do not provide a continuous set of values (ii) represent values as discrete steps (iii) can utilize only binary system and (iv) can utilize decimal as well as binary system . which of the following options is true ?

Question

$\begin{array}{1 1} only\; (i)\; and\; (ii) \\ only\; (ii)\; and\; (iii) \\ only\; (i),(ii)\;and (iii) \; but \;not\;(iv) \\ All\;the\;above\;(i) \;to\;(iv) \end{array}$