A systems administrator confirms that the company's remote server is providing the following list

of preferred ciphers:

$-$ TLS$\_$ECDHE$\_$RSA$\_$WITH$\_$AES$\_256\_$GCM$\_$SHA$384(0$xc$030)$

$-$ TLS$\_$ECDHE$\_$RSA$\_$WITH$\_$AES$\_256\_$CBC$\_$SHA$384(0$xc$028)$

$-$ TLS$\_$ECDHE$\_$RSA$\_$WITH$\_$AES$\_256\_$CBC$\_$SHA $(0$xc$014)$

$-$ TLS$\_$RSA$\_$WITH$\_$RC$4\_128\_$SHA $(0$x$5)$

$-$ TLS$\_$RSA$\_$WITH$\_$RC$4\_128\_$MD$5(0$x$4)$

Nevertheless, when the systems administrator's browser connects to the server, it negotiates

TLS$\_$RSA$\_$WITH$\_$RC$4\_128\_$MD$5(0$x$4),$ while all other employees' browsers negotiate

TLS$\_$ECDHE$\_$RSA$\_$WITH$\_$AES$\_256\_$GCM$\_$SHA$384(0$xc$030).$ Which of the following describes

a potential attack to the systems administrator's browser?

A$.$ A cipher mismatch

B$.$ Key rotation

C$.$ A downgrade attack

D$.$ A compromised key

E$.$ Rekeying