If $f(x) = \begin{cases} 2a - x & \text{when } -a < x < a \\ 3x - 2a & \text{when } a \leq x \end{cases}$,then which of the following is true?

  • A
    $f(x)$ is not differentiable at $x = a$
  • B
    $f(x)$ is discontinuous at $x = a$
  • C
    $f(x)$ is continuous for all $x < a$
  • D
    $f(x)$ is differentiable for all $x \geq a$

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