Which of the following statements describe a client$/$server model $?$

Select one or more:

a$.$

Computer transactions using the client$/$server model are very common.

b$.$

Client$/$server describes the relationship between two computer programs in which one program, the server, makes a service request from another program, the client, which fulfills the request.

c$.$

Although the client$/$server idea can be used by programs within a single computer, it is a more important idea in a network.

d$.$

In a network, the client$/$server model provides a convenient way to interconnect programs that are distributed efficiently across different locations.

e$.$

Client$/$server computing or networking is a distributed application architecture that partitions tasks or work loads between service providers $($servers$)$ and service requesters, called clients.