Which of the following is added to prefs.js,when open a dialog box each time an error occurs?

user_pref("javascript.classic.error_alerts ", false);

user_pref("javascript.classic.error_alerts", true);

user_pref("javascript.console.open_on_error ", false);

user_pref("javascript.console.open_on_error ", true);

Which of the following is added to prefs.js,when open a dialog box eac

1.	Which of the following is added to prefs.js,when open a dialog box each time an error occurs?
A.	user_pref("javascript.classic.error_alerts", true);
B.	user_pref("javascript.classic.error_alerts ", false);
C.	user_pref("javascript.console.open_on_error ", false);
D.	user_pref("javascript.console.open_on_error ", true);
Answer» B. user_pref("javascript.classic.error_alerts ", false);