The magnetic moment of electron in an atom(excluding orbital magnetic moment) is given by

Question

$\begin{array}{1 1}(a)\;\sqrt{n(n+2)}\;Bohr\; Magneton(or\;BM)\\(b)\;\sqrt{n(n+1)}BM\\(c)\;\sqrt{n(n+3)}BM\\(d)\;None\;of\;these\end{array}$