I would like some comments on the following, concerning “bubble” wp covers.

Locations:
#1: 20a, 125v, outlet located outdoors, on the outside of a building.
A: Outlet will be “attended”
B: Outlet will be “un-attended”
#2: 20a, 125v, outlet located in a wash-down area, inside of a building.
A: Outlet will be “attended”
B: Outlet will be “un-attended”
#3: 30a, 250v outlet located outdoors, on the outside of a building.
A: Outlet will be “attended”
B: Outlet will be “un-attended”
#4: 30a, 250v outlet located in a wash-down area, inside of a building.
A: Outlet will be “attended”
B: Outlet will be “un-attended”

Note: All locations are considered wet locations by code.

Questions:
On which installation is a bubble type cover required? By which article?
On which installation is a regular flat type wp cover allowed? By which article?

Thanks, Rick Miell