An n-channel enhancement-mode MOSFET with Vth=1V has a drain current Id=0.6mA when Vgs=3V and Vds=1V. Calculate Id if ________.
1) Vgs=2V and Vds=1V
2) Vgs=3V and Vds=2V
3) Vgs=2V and Vds=2V
4) Vgs=3V and Vds=3V