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For the n-channel MOS transistor shown in the figure, the threshold voltage $V_{Th}$ is $0.8$ V. Neglect channel length modulation effects. When the drain voltage $V_{D}= 1.6 V,$ the drain current $I_{D}$ was found to be  $0.5$ mA. If $V_{D}$is adjusted to be $2$ V by changing the values of R and $V_{DD}$, the new value of $I_{D}$ (in mA) is

1. $0.625$
2. $0.75$
3. $1.125$
4. $1.5$