Which function is represented by the graph above ?
A: f (x) = { -x - 3, x less than equal to 0
{ 1/2x + 1, x > 0
B: f (x) = { x - 3, x less than equal to 0
{ -1/2x + 1, x > 0
C: f (x) = {-x + 3, x less than equal to 0
{ 1/2x + 1, x > 0
D: f (x) = { x + 3, x less than equal to 0
{ - 1/2x + 1, x >0