Rubbing two sticks together will cause friction
B. Internet Telephony would be my best guess. I'm not that good with computers. Hope this Helps :-)
First B
Second A
Seems like the best answers
It would help if there is a programming language in the context of which you need this answered. For instance in Python you can create a program like this:
print(type("Hello"))
print(type(1337))
print(type(True))
print(type("3.14"))
It will return:
<class 'str'>
<class 'int'>
<class 'bool'>
<class 'str'>
