______ MESSAGING IS A TYPE OF SERVICE AVAILABLE ON THE INTERNET THAT ALLOWS YOU TOEXCHANGE WRITTEN MESSAGES WITH SOMEONE ELSE WHO IS USING THE SERVICE AT THE SAME TIME

Câu 21:

______ messaging is a type of service available on the Internet that allows you to

exchange written messages with someone else who is using the service at the same time.

A.

Efficient

B.

Fast

C.

Instant

D.

Constant