You want to generate an email body which varies from one Appian environment to another. For instance, between DEV and TE

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You want to generate an email body which varies from one Appian environment to another. For instance, between DEV and TEST.
According to Appian best practices, how should you define the environment name? (Choose the best answer.)

A. Create an expression rule and update its value post-deployment.
B. Create an environment-specific constant.
C. Create a constant and update its value post-deployment.
D. Create a stored procedure.