How can you check whether IP forwarding is enabled on an IP Security Appliance?

How can you check whether IP forwarding is enabled on an IP Security Appliance?

A.
clish -c show routing active enable

B.
ipsofwd list

C.
cat /proc/sys/net/ipv4/ip_forward

D.
echo 1 > /proc/sys/net/ipv4/ip_forward