SALESFORCE-PD1 Developer Fundamentals Practice Question
What is the correct file extension for an Apex class created in Salesforce DX?
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
✓
.cls
Apex class files use the .cls extension, accompanied by a .cls-meta.xml metadata file.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
.apex
Why it's wrong here
.apex is not the standard extension for Apex classes.
- ✗
.controller
Why it's wrong here
.controller is not a valid file extension.
- ✓
.cls
Why this is correct
Apex classes use the .cls extension.
- ✗
.trigger
Why it's wrong here
.trigger is used for Apex triggers.
About these practice questions
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JA
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
This SALESFORCE-PD1 practice question is part of Courseiva's free Salesforce certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SALESFORCE-PD1 exam.