Hàm số y = |x+1| - |x-3| được viết lại là

A. $$\begin{gathered} y = \left\{\begin{array}{l}-2x+2 khi x\le -1 \\ 4 khi -1<x\le 3\\ 2x-1 khi x>3\end{array}\right. \end{gathered}$$

B. $$\begin{gathered} y =\left\{\begin{array}{l}2x-2 khi x\le -1\\ 4 khi -1<x\le 3 \\ -2x+2 khi x>3\end{array}\right. \end{gathered}$$

C. $$\begin{gathered} y = \left\{\begin{array}{l}2x+2 khi x\le -1\\ 4 khi -1<x\le 3 \\ -2x-2 khi x>3\end{array}\right. \end{gathered}$$

D. $$\begin{gathered} y = \left\{\begin{array}{l}-2x+2 khi x\le -1 \\ 4 khi -1<x\le 3\\ 2x-2 khi x>3\end{array}\right. \end{gathered}$$