EX188 Container Image Building Practice Question
Which TWO instructions are used to define variables or set environment values within a Containerfile? (Choose two.)
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
✓
ARG
ARG and ENV are used for defining build arguments and environment variables respectively.
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
Why it's wrong here
DEFINE is not a valid instruction.
- ✗
VAR
Why it's wrong here
VAR is not a valid instruction.
- ✓
ARG
Why this is correct
ARG defines build-time variables.
- ✓
ENV
Why this is correct
ENV defines runtime and build-time persistent environment variables.
- ✗
SET
Why it's wrong here
SET is not a valid instruction.
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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 Red Hat exam blueprint
This EX188 practice question is part of Courseiva's free Red Hat 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 EX188 exam.