The radii $r_1,r_2,r_3$ of described circle of a $\Delta$le ABC are in harmonic progression.If its area is 24sq .cm,and its perimeter is 24,find the lengths of its sides

Question

$\begin{array}{1 1}(a)\;a=6,b=8,c=10&(b)\;a=7,b=9,c=11\\(c)\;a=0,b=2,c=3&(d)\;None\;of\;these\end{array}$