The electrons,identified by quantum number n and l,(i) n=4,l=1;(ii) n=4,l=0;(iii) n=3,l=2;(iv) n=3,l=1 can be placed into order of increasing energy,from the lowest to highest,as :

Question

$\begin{array}{1 1}(a)\;(iv) < (ii) < (iii) < (i)\\(b)\;(ii) < (iv) < (i) < (iii)\\(c)\;(i) < (iii) < (ii) < (iv)\\(d)\;(iii) < (i) < (iv) < (ii)\end{array}$