Respuesta :

maniknandini

Answer:

2nd option

Step-by-step explanation:

As you can see in the graph

there are both inclusive and exclusive points

for d(x) = 1 if 1 <= x < 4 here 1 inclusive and 4 exclusive

= 2 if 4 <= x < 6

= 3.5 if 6 <= x < 11

= 5 if 11 <= x < 13

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