Which of the following is not a part of default Red Hat Linux email system ?

A. network layer
B. transport layer
C. physical layer
D. physical layer

A. which
B. pwd
C. i /4
D. who am i

A. comp
B. cmp
C. do
D. ccp

A. w
B. e
C. a
D. b

A. count p
B. wc
C. wcount
D. countw

A. nfsmount
B. knfsd
C. mount
D. All of the above