Challenge 2: Write a Connection String — Possible Solution
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mongodb://db.internal:27018/inventory

WHY THIS WORKS AS AN ANSWER
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The connection string format is mongodb://<host>:<port>/<database>,
and each piece maps directly onto what the scenario specified:
  - Host: db.internal
  - Port: 27018 (explicitly NOT the default 27017, so it must be
    stated — omitting it would cause a client to fall back to the
    default port, connecting to the wrong instance)
  - Database: inventory

Getting the port right here matters specifically because this
scenario deliberately used a non-default port — a connection string
that just wrote "mongodb://db.internal/inventory" (leaving the port
out) would silently try port 27017 instead, which is a realistic real-
world mistake when a MongoDB instance has been configured to listen
on a non-standard port for any reason (e.g. security through a
non-default port, or multiple instances on one host).