For an $n$-channel $\text{MOSFET}$ and its transfer curve shown in the figure, the threshold voltage is
- $1 \mathrm{~V}$ and the device is in active region.
- $-1 \mathrm{~V}$ and the device is in saturation region.
- $1 \mathrm{~V}$ and the device is in saturation region.
- $-1 \mathrm{~V}$ and the device is in active region.