Answer:
see below
Explanation:
A filled dot means the function is defined there. An open dot means it is not defined there. A portion of the graph with no line or curve means the function is undefined there.
The domain is the horizontal extent of the function definition. Here, the function is defined between -8 and +8 with a hole between 3 and 4. The appropriate answer is the one that has two pieces. See the attachment.