You need to write a console application that meets the following requirements:
If the application is compiled in Debug mode, the console output must display Entering debug mode.

If the application is compiled in Release mode, the console output must display Entering release
mode.
Which code should you use?

A.
Option A

B.
Option B

C.
Option C

D.
Option D

Explanation:
When the C# compiler encounters an #if directive, followed eventually by an #endif directive, it will
compile the code between the directives only if the specified symbol is defined. Unlike C and C++,
you cannot assign a numeric value to a symbol; the #if statement in C# is Boolean and only tests
whether the symbol has been defined or not. For example,
#define DEBUG
// …
#if DEBUG
Console.WriteLine(“Debug version”);
#endif