Which of the following correctly describes a difference between asynchronous and syn$-$

chronous communication?

A$.$ In asynchronous the client is always blocking and waiting for the server's response

B$.$ In synchronous all clients have access to a global clock and can explicitly synchronise

C$.$ In asynchronous both the client and the server need to be online

D$.$ In synchronous the client can continue to work while the server is processing its request

E$.$ In asynchronous the client can continue to work while the server is processing its re$-$

quest