Continuity and Differentiability of a Piecewise Function

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Let $k$ be the function defined by $k(x) = \begin{cases} x^2 - 1 & \text{if } x \leq 3 \\ 2x + 1 & \text{if } x > 3 \end{cases}$ . Which of the following statements about $k$ at $x=3$ is true?

$k$ is continuous and differentiable at $x = 3$ .

$k$ is continuous but not differentiable at $x = 3$ .

$k$ is defined but neither continuous nor differentiable at $x = 3$ .

$k$ is differentiable but not continuous at $x = 3$ .

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