Please help, what OS does it run on?

I hope the folks here are more helpful to someone needing help. I got three different answers from three Lenovo reps and don't what to make them (one rep told me to ask Bill Gates).

The computer specs say "Windows 7 preinstalled through downgrade rights in Windows 10". So when one receives the computer, what is it running on? 7 or 10?

Also, if it's 7 (or 10), will it be a simple matter (and free) to upgrad/downgrade to 10 (or 7).

Thank you in advance for your time. Hope I get corrrect answers.

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Please help, what OS does it run on?