200-901 Application Deployment and Security Practice Question
A developer creates a Dockerfile for a Python web application. Which instruction should be used to copy the application source code into the container image?
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
✓
COPY
The COPY instruction copies files or directories from the build context into the container filesystem. RUN executes commands, EXPOSE documents ports, and CMD sets default command.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
CMD
Why it's wrong here
CMD provides defaults for executing container, not copying files.
- ✓
COPY
Why this is correct
COPY is the correct instruction to copy files into the image.
- ✗
RUN
Why it's wrong here
RUN executes commands during build, not for copying files.
- ✗
EXPOSE
Why it's wrong here
EXPOSE documents ports, does not copy files.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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