Find the Equation of the Tangent Line to the Curve $\mathbf{x}$

Multiple Choice

Find the equation of the tangent line to the curve when $\mathbf{x}$ has the given value.
- $f(x) =\sqrt{x} ; x=4$

A) $y=-7 x+28$
B) $y=\frac{x}{2}-\frac{1}{2}$
C) $y=\frac{x}{4}+1$
D) $y=-7 x-9$