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A tech blogger is writing a frantic warning about a rogue appliance. Select ALL the grammatically correct sentences to help her publish the post.
The correct answers are The smart fridge that ordered 50 gallons of milk is finally unplugged. and The smart fridge which ordered 50 gallons of milk is finally unplugged.
For defining relative clauses about things, both that and which are perfectly correct.
"Who" is incorrect because a fridge is an object, not a person. The sentence with commas is a non-defining relative clause, and we can never use that after a comma in a non-defining clause.