Velocity as the Derivative of Displacement

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The displacement of a particle is given by the function $s(t) = \sqrt{4t+1}$ . What is the velocity of the particle, $v(t) = \frac{ds}{dt}$ ?

$\frac{4}{\sqrt{4*t+1}}$

$\frac{2}{\sqrt{4*t+1}}$

$\frac{1}{\sqrt{4*t+1}}$

$\frac{2}{\sqrt{t+1}}$

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