An IDEMPOTENT script can be re-run any number of times and
always converges to the same end state, without errors.
Which is the BEST example of idempotent infrastructure code?
A) "if not exists, create" + "if exists, update" everywhere
B) Always running `mkdir /opt/app` (errors on the second run)
C) Always appending to a config file (grows forever)
D) Always running `rm -rf /var/data`
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