Question 1hardmulti select
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You are building a Docker image for a Python web application. The Dockerfile currently contains:
FROM python:3.9-slim COPY . /app WORKDIR /app RUN pip install -r requirements.txt CMD ["python", "app.py"]
After building, you notice that every time you change app.py, the entire pip install step re-runs, making builds slow. Which change to the Dockerfile will best address this?