Two periodic waves of intensities $I_1$ and $I_2$ pass through a region at the same time in the same direction. the sum of the maximum and minimum intensities is -

Question

( A ) $(\sqrt{I_1}-\sqrt{I_1})^2$
( B ) $(\sqrt{I_1}+\sqrt{I_1})^2$
( C ) $I_1+I_2$
( D ) $2(I_1+I_2)$