Consider the following code:

var firstResult $=$ "Pass";

alert $($firstresult$)$;

Sophia ran this code expecting the alert$()$ box to display the word "Pass". Instead, the alert$()$ box did not work. What is the problem?

A $$ JavaScript variable names must be written in all lowercase; the variable name defined is invalid.

B $$ JavaScript variable names must be written in all uppercase; the variable name defined is invalid.

C $$ JavaScript variable names must have a space between two words; the alert method is calling an invalid variable name.

$$ JavaScript is case sensitive; the alert method is calling an invalid variable name.