This question is incomplete. The complete question is attached below:
Answer:
Insertion Point 1
Explanation:
The include statement is used to import any kind of header file or a library.
All the structure of programming languages such as C++, header files and libraries are import at the top of file i.e. the Insertion Point 1.
Insertion Point 2 is the area where generally main logic of the program exits so can't use the include statement here.
Insertion Point 3 and anywhere in the program are syntactically wrong approach to use the include statement and will result in an error as the program will not compile.