In a bias circuit with a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) connected with vg=5V, rs=3kΩ, vt=1V, and kn=2mA/V², what bias current id results?
a) 0.5 mA
b) 1 mA
c) 1.5 mA
d) 2 mA