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# Which of the following is not permissible arrangement of electrons in an atom ?

$\begin{array}{1 1} (a)\;n=4,I=0,m=0,s=-\large\frac{1}{2} \\ (b)\;n=5,I=3,m=0,s=+\large\frac{1}{2} \\ (c)\;n=3,I=2,m=3,s=-\large\frac{1}{2} \\ (d)\;n=3,I=2,m=2,s=\large\frac{1}{2} \end{array}$