Question

The first few lines of a script that say "using" ... that point the code to the right groups are called

Answer 1

Answer :

Using in case of programming script is used to include pre-defined and pre-compiled files that have functions and logic writer that can be re-used in the new program. This saves developer time to re-write the function, which on the contrary can use the same function calls to perform the task. This area is known as Preprocessor Directive