Which of the Following Is a Piecewise Formula for the Function

Multiple Choice

Which of the following is a piecewise formula for the function $f(x) =|3 x-15|$

A) $f(x) = \begin{cases}15-3 x, & x \leq 5 \\ 3 x-15, & x>5\end{cases}$
B) $f(x) = \begin{cases}3 x-15, & x \leq 5 \\ 15-3 x, & x>5\end{cases}$
C) $f(x) = \begin{cases}15-3 x, & x \leq 15 \\ 3 x-15, & x>15\end{cases}$
D) $f(x) = \begin{cases}3 x-15, & x \leq 15 \\ 15-3 x, & x>15\end{cases}$