Refer to the interface Sellable:

interface Sellable $\{$

$/**$ Returns a description of the object. $*/$

public String description$()$;

$/**$ Returns the list price in cents. $*/$

public int listPrice$()$;

$/**$ Returns the lowest price in cents we will accept. $*/$

public int lowestPrice$()$;

$\}$

What must be true of any class that implements Sellable?

Group of answer choices

gives an implementation of method String description$()$

gives an implementation of method int listPrice$()$

gives an implementation of method int lowestPrice$()$

has an instance variable keeping a description

has an instance variable keeping a price

has a constructor that takes arguments: a String $($for the description$)$ and an int $($for the price$)$