SALESFORCE-PD1 User Interface Practice Question
A developer is utilizing the Lightning Message Service (LMS) to facilitate communication between an Aura component and a Lightning Web Component. Which THREE steps are required to implement LMS successfully? (Choose THREE)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Define a Message Channel in XML format under the /messageChannels/ directory.
LMS requires defining a Message Channel metadata file, importing the channel in the component, and calling publish or subscribe APIs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Define a Message Channel in XML format under the /messageChannels/ directory.
Why this is correct
Correct because Message Channels are defined as metadata files in the force-app directory.
- ✓
Import the Message Channel reference into the LWC using '@salesforce/messageChannel/ChannelName__c'.
Why this is correct
Correct because message channels must be imported using the scoped module import.
- ✗
Create an Apex trigger to listen to the Message Channel on the server side.
Why it's wrong here
Incorrect because LMS is strictly a client-side communication mechanism and cannot be accessed by Apex triggers.
- ✓
Use publish() or subscribe() functions from the 'lightning/messageService' module.
Why this is correct
Correct because LMS provides publish and subscribe functions via lightning/messageService.
- ✗
Configure the component metadata file with <target>lightning__MessageChannel</target>.
Why it's wrong here
Incorrect because message channels are standalone metadata types, not component targets.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Salesforce exam blueprint
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