Answer is D.
registerEvent() isnt a thing, you use <aura:registerEvent ... in markup.
https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/events_component_example.htm
fireEvent() seems to only be for custom events.
https://developer.salesforce.com/docs/atlas.en-us.api_console.meta/api_console/sforce_api_console_fireevent.htm
emit() is JS
fire()
upvoted 3 times
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1vanTT
2 months, 4 weeks ago