I think it's the lest one: Rights given to original authors and creators to protect their work from unlawful use
True because that's what i said it is
I don't see any error on your code, everything is well written and simple. Except trying putting PUBLIC on your Class displayer. If you encounter the same problem again try to rebuild your whole code and try to recompile the whole code. Even try restarting your personal computer.
Answer:
The answer is "14".
Explanation:
Let the IP address 
When it borrowed 4 bits
If the borrowed bits are left out then:
The Number of useable host addresses:
