If pin $A$ is connected with single shear connection, $Ax=3kN$ and $Ay=3kN$ and shear failure stress $({}_{\text{f}\text{a}\text{i}\text{l}\text{u}\text{e}})$ is $500$MPa while factor of safety is $2\mathrm{.}5,$ find diameter of pin A

a$.2\mathrm{.}64mm$

b$.1\mathrm{.}00mm$

c$.5\mathrm{.}20mm$

d$.2\mathrm{.}18mm$