Linux Kernel Parameters task

I have tried to complete the Linux Kernel Parameters task as per my knowledge.
I have checked 2-3 times whether my changes gets reflected or not.
But its current status is failed.
I tried to set kernel parameter net.ipv4.ip_forward = 0
Could anyone please help me to understand where I did wrong?
I have attached screenshot of my terminal.
Thanks.

you have to make it permanent. Add in
/etc/sysctl.conf :-
net.ipv4.ip_forward =