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Consider the following two statements about the internal conditions in an n-channel MOSFET operating in the active region.
$\qquad \qquad \text{S1:}$ The inversion charge decreases from source to drain
$\qquad \qquad \text{S2:}$ The channel potential increases from source to drain

Which of the following is correct?

1. Only $\mathrm{S} 2$ is true
2. Both $\mathrm{S} 1$ and $\mathrm{S} 2$ are false.
3. Both $\mathrm{S} 1$ and $\mathrm{S} 2$ are true, but $\mathrm{S} 2$ is not a reason for $\mathrm{S} 1$
4. Both $\mathrm{S} 1$ and $\mathrm{S} 2$ are true, and $\mathrm{S} 2$ is a reason for $\mathrm{S} 1$