A hairpin like shape as shown in figure is made by bending a long current carrying wire. What is the magnitude of a magnetic field at point $$P$$ which lies on the centre of the semicircle?

A

$$\frac{\mu_0 I}{4\pi r}(2 - \pi)$$

B

$$\frac{\mu_0 I}{4\pi r}(2 + \pi)$$

C

$$\frac{\mu_0 I}{2\pi r}(2 + \pi)$$

D

$$\frac{\mu_0 I}{2\pi r}(2 - \pi)$$