c) open
I think this because when you're in an open space (such as starbucks) it's public for anyone to enter. I think.
Answer:
IP address
Explanation:
In computer networks, every computer has assigned with a unique address that is called logical address or IP address.
This address is assigned by ICANN and used to access that particular computer by other computers on the network.
The rules of a programming language constitute its syntax.
