Which channel definition will require that client applications using channel ABC establish a
mutually authenticated SSL channel?

A.
DEFINE CHANNEL(ABC) CHLTYPE(SVRCONN) +
SSLCIPH(NULL_MD5)SSLCAUTH(REQUIRED)

B.
DEFINE CHANNEL(ABC) CHLTYPE(SVRCONN) + SSLCIPH() SSLCAUTH(REQUIRED)

C.
DEFINE CHANNEL(ABC) CHLTYPE(SVRCONN) +SSLCIPH(NULL_MD5)
SSLCAUTH(MUTUAL)

D.
DEFINE CHANNEL(ABC) CHLTYPE(SVRCONN) + SSLCIPH() SSLCAUTH(MUTUAL)