Step-by-step explanation:
Check second one
[tex]\\ \rm\Rrightarrow k(x)=(-x+3)^{\frac{1}{2}}[/tex]
- 1/2 means square root
[tex]\\ \rm\Rrightarrow \sqrt{(-x+3)}[/tex]
So
[tex]\\ \rm\Rrightarrow -x+3>0[/tex]
[tex]\\ \rm\Rrightarrow -x>-3[/tex]
[tex]\\ \rm\Rrightarrow x<3[/tex]
Hence.
Domain is restricted
Option B is correct
