Which of the following pairs of solutions are expected to be isotonic?

Question

$\begin{array}{1 1} 0.1\;M\;urea\;and\;0.1\;M\;NaCl \\0.1\;M\;urea\;and\;0.1\;M\;MgCl_2 \\ 0.1\;M\;Ca(NO_3)_2\;and\;0.1\;M\;Na_2SO_4 \\ 0.1\;M\;Nacl\;and\;0.1\;M\;glucose \end{array} $