15.5`mule-artifact.json`

You'll encounter:

mule-artifact.json

This contains Mule application metadata.

Conceptually it tells Mule things such as:

required Mule runtime version
application configuration metadata
exported resources/packages
secure-property metadata

You don't need to memorize its schema for the interview.

Know that:

pom.xml

is largely Maven/build/dependency configuration,

while:

mule-artifact.json

describes the Mule artifact itself.