Four linear elastic springs are connected to mass ‘M’ as shown in Figure. The natural frequency of the system is

A

$$\frac{({\sqrt 4k/3m)}} {2\pi}$$

B

$$\frac{({\sqrt 4k/m)}} {2\pi}$$

C

$$\frac{({\sqrt k/4m)}} {2\pi}$$

D

$$\frac{({\sqrt 3k/4m)}} {2\pi}$$