What does the variable string contain after the following code is executed?

var string $=$ "Good luck on the test";

string $=$ string.split$("")$;

Question $12$ options:

the string "Good.luck.on$.$the.test"

Nothing, the string conversion will generate an error.

an array containing the strings "Good", "luck", $"$on$",$ "the" and "test"

the string "Good,luck,on$,$the,test"