A flexible chain of mass m hangs between two fixed points at the same level. The inclination of the chain with the horizontal at the two points of support is $$30^{\circ}$$. Considering the equilibrium of each half of the chain, the tension of the chain at the lowest point is __________.

A

$$\sqrt{3}mg$$

B

mg

C

$$\frac{1}{2}mg$$

D

$$\frac{\sqrt{3}}{2}mg$$