I want to look at average price by number of people accommodated in a neighborhood in each city. Which of these will do that $($assuming the databases are already merged$)$:

$1.$

merged$\_$df$.$groupby$([\text{'}$price$\text{'}])(\text{'}$neighborhood$\text{'},$ 'accommodations', 'city'$).$max$()$

$2.$

merged$\_$df$.$groupby$([\text{'}$city$\text{'}])(\text{'}$neighborhood$\text{'},$ 'accommodations', 'price'$).$mean$()$

$3.$

merged$\_$df$.$groupby$([\text{'}$city$\text{'},$ 'neighborhood', 'accommodations'$])[\text{'}$price$\text{'}].$mean$()$

$4.$

merged$\_$df$.$groupby$([\text{'}$price$\text{'}])(\text{'}$neighborhood$\text{'},$ 'accommodations', 'city'$).$mean$()$