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What does the butcher's (meaning the butcher's shop) become in the plural?

If the sentence in the singular is:

The butcher's and the hairdresser's are closed on Sunday.

What happens to the genitive if I want to make it plural?

  1. Butchers and hairdressers are closed on Sunday.

  2. Butchers' and hairdressers' are closed on Sunday.

  3. Butcher's shops and hairdresser's salons are closed on Sunday.