# Method:

class Cart$()$:

def $\_\_$init$\_\_($self$)$:

self.cart $=[]$

self.total $=0$

def add$\_$to$\_$cart$($self$,$ item$)$:

self.cart.append$($item$)$

self.total $+=$ item.price

The following class $```$Cart$```$ and method $```$add$\_$to$\_$cart$```$ are parts of a larger program used by a mobile phone company. The method $```$add$\_$to$\_$cart$```$ will work when an object of type MobileDevice or of type ServiceContract is passed to it$.$ State whether the method $```$add$\_$to$\_$cart$```$ is a demonstration of the following items $($yes$/$no$)$ and the reasoning $(1-2$ sentences$)$:

$1.$ Inheritance

$2.$ Polymorphism

$3.$ Object$-$Oriented programming

$4.$ Top$-$down design

$5.$ Functional programming