Secure Sockets Layer $($SSL$)$ is a standard security technology for establishing an encrypted link between a client and a server $-$ typically a web browser and a web server $($website$).$ Which of the following statements about SSL is not true?

The master$\_$secret key is computed by the server with pre$\_$master$\_$secret, client$\_$random and server$\_$random.

The client authentication is mandatory.

The server authentication is optional.

Message Authentication Code $($MAC$)$ is computed after the data is encrypted.

The data is decompressed before decrypted.

In the session resumption handshake protocol, the pre$\_$master$\_$secret of the previous session is re$-$used.