Piecewise

Problem:



Solution:

Notice the hollow circle on the top horizontal line, it means that point is not included, so the horizontal line can be described as:

$f(x) = 4$ when $x > -3$

The solid dot in the slanted line below indicate that point is included, so that part is

$f(x) = -x$ when $x \le -3$.

Therefore the answer is (A), and just few those numbers above in.