Which command shows, amongst other information, the IP address of the current DNS server for a Linux system?

Which command shows, amongst other information, the IP address of the current DNS server for
a Linux system?

A.
cat /etc/net/dns.conf

B.
ifconfig -v dns

C.
show net dns

D.
cat /etc/resolv.conf

E.
cat /etc/net/nameserver.conf