Consider the following class:

@dataclass

class Desk:

drawers: list$[$Drawer$]=$ field$($default$\_$factory$=$list$)$

def open$\_$drawer$($self$,$ drawer$\_$number: int$)$:

pass

def close$\_$drawer$($self$,$ drawer$\_$number: int$)$:

pass

def is$\_$open$($self$,$ drawer$\_$number: int$)->$ bool:

pass

def add$($self$,$ jnk: Junk, to$\_$drawer: int$)$:

pass

def remove$\_$random$\_$item$($self$,$ from$\_$drawer: int$)->$ Drawer:

pass

Which functions of this class are missing a non$-$trivial pre$-$condition?

Group of answer choices

add

remove$\_$random$\_$item

is$\_$open

close$\_$drawer

open$\_$drawer