Answer: Public
Explanation:
A top level class can have a public, as top level cannot be private and protected because the modifier private is not allowed. As, top level is a class which is not a nested class. Interface of a access modifier is either public or no modifier. There are two types of access control modifier are top level - public and member level- private, protected.
Answer: Find answers in the attachments
Explanation:
It's VPN(Virtual Private Network). It allows company to have private network at the same time secure. While others are not that secure.
