How to enable "Developer Options" & change CPU Runtime?

Many people wants to change their CPU Runtime & Wants to enable Developer options.
Here is some simple steps to get it:-
1.At first Go To Settings>>About Phone>>Build Number
2.Tap on "Build Number" 8-9 times.
3.Go back to the previous screen & then you can see "Developer Option"
4.Select it.
5.Tap on "Select Runtime"
6.Change it to Art/Dhalvik
7.Reboot phone.
8.That's it & you have successfully changed your Runtime.
*Note:-
All apps doesn't support On Art but you can get better battery back up on Art.
To get support of All apps & games change Runtime to "Dhalvik"