Solve this:
Q.3. In figure two identical particles each of mass m are tied together with an inextensible string. This is pulled at its centre with a constant force F. If the whole system lies on a smooth horizontal plane, then the relative acceleration between the particles is

A) $\frac{\sqrt{3}}{2}\frac{F}{M}$
B) $\frac{1}{2\sqrt{3}}\frac{F}{M}$
C) $\frac{2}{\sqrt{3}}\frac{F}{M}$
D) $\frac{F}{\sqrt{3}M}$