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.