Answer:
Fortnite has been made by Epic Games with their own engine What is Unreal Engine 4 that is freely available to everyone. The cool thing about it is that it doesn't require a programming language to make games. Unreal Engine itself is made in C++, but developers mostly use its main feature, blueprints.
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Port 20 is ftp-data.
Port 21 is ftp.
Port 21 is the control channel. Port 20 is only used in Active mode. In Passive mode, port 20 isn't used, the data channel is established by the client to a high port number on the server. You can check RFC 873 for a LOT more info.
It is either C or, as you said, D.
The standard American telephone number is ten digits, such as (555) 555-1234. The first three digits are the "area code," which, in the past, indicated in what part of the country the phone was located.
The regular American telephone number has 10 digits, such as (999) 000-0000. The nines, or 3 digits, are the area code of the phone.
They are required numbers that are based off of where the phone is, the area code.
First one is correct the second one is incorrect. a method that is public in a class may be invoked when an instance of the class is created
Myclass myclass = new Myclass() <--- instance of the class created
myclass.mymethodinvoked() <-----invoking public method