Who is responsible for shoveling snow in an apartment, the landlord or the tenant?

The apartment is a duplex with the landlord on one side and the tenant on the other side.Therefore it is an owner occupied unit.
Update: I am not the owner. I am the renter. The owner, the landlord lives in the house. It is a duplex. Wouldn't it be her responsibility and not mine? She owns the house and the driveway. I don't own it. Why should I be responsible for property I do not own?
Update 2: Let the mailman slip on the ice and snow. He'll sue the landlord anyway.
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