You are writing a Web application that processes room reservation requests. You need to
verify that the room that a guest has selected is not already reserved by another guest.
Which type of programming should you use to determine whether the room is still available
when the request is made?

A.
client-side

B.
server-side

C.
multithreaded

D.
batch processing

Explanation:
For room availability we need to check a database located on a server.