Domain of sqrt(x - 1) + sqrt(k - x)

1. A.
   $[0, \infty)$
2. B.
   $\mathbb{R}$
3. C.
   $[1, 3]$
4. D.
   $[2, 2]$

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1. A.
   $[1, \infty)$
2. B.
   $[1, 6]$
3. C.
   $(-\infty, 1)$
4. D.
   $(6, \infty)$

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