How do you apply the PHP version upgrade?

You are upgrading a project to the latest version of Magento Commerce Cloud and part of the process involves a PHP version upgrade. This is now ready to be tested by the QA Team on the Integration environment.

How do you apply the PHP version upgrade?
A . Change the PHP version in the .magento.app.yaml file and re-deploy
B . SSH into the Integration environment and upgrade PHP manually
C . Change the PHP_VERSION configuration in the .magento.env.yaml file and re-deploy
D . Use the magento-cloud CLI tool to update the PHP_VERSION variable

Answer: A

Explanation:

Reference: https://devdocs.magento.com/cloud/project/project-upgrade.html