In the figure Shown, $S_1 and S_2$ are two identical point sources of sound which are coherent having phase difference ${180}^0$ (out of phase). Taking $S_1$ as Centre, two circular arcs $\mathcal{l}andm$ of radii 1m and 2m respectively are drawn. Taking $S_2$ as center two circular arcs $p$ and $q$ of radii 2m and 4m respectively are drawn. It is given that wavelength of wave produced by each source is 4.0 m. then correct options among the following assuming amplitude of wave on arc ‘m’ be A due to source $S_1$ about Out of the four intersection points A, B,C and D is/are