The step function f(x) is graphed. what is the value of f(−1)?

Notice that the first interval [-3,-1) is closed at -3 but open at -1, which means that when the value of  is between -3 and -0.999... the value of   is -3; in other words the function for the first piece is:
  ,  

The second interval [-1,1) is closed at -1 but open at 1, which means that when the value of  is between -1 and 0.999.. the value of  is -1; in other words, the function of the second piece is:
  , 

We can conclude that the value of is -1.

Ithink it is b and d