Which one of the following is NOT a debugging strategy for client-side scripts?

Which one of the following is NOT a debugging strategy for client-side scripts?
A . g_form.addInfoMessage()
B . Field Watcher
C . jslog()
D . gs.log()

Answer: D

Explanation:

Reference: https://developer.servicenow.com/dev.do#!/learn/learning-plans/istanbul/new_to_servicenow/app_store_learnv2_scripting_istanbul_debugging_client_scripts