* setInterval(fn, delay, arg1, arg2, ...) calls fn every delay ms, passing extra arguments.
* To call isDeg every 60 seconds with " cat " :
setInterval(isDeg, 60000, ' cat ' );
Why others are wrong:
* A/D: isDeg( ' cat ' ) is called immediately, and its return value is scheduled, not the function.
* C: setTimeout runs once after 60 seconds, not repeatedly.