If programming a class to represent a calculator, which class containing methods with parameters could be used to add and subtract input values x and y$,$ and increment the total number of calculations performed?

a$.)$

class Calc:

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

self. num$0$fCalcs $=0$

def add$($self$,$ x$,$y$)$:

self. num$0$fCalcs $+=1$

return $x+y$

def sub$($self$,$ x$,$y$)$:

self. num$0$fCalcs $+=1$

return $x-y$

b$.)$

class Calc:

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

self. num$0$fCalcs $=0$

def add$(self,x,y)$ :

num$0$fCalcs $+=1$

return $x+y$

def sub$(self,x,y)$ :

c$.)$

class Calc:

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

self. num$0$fCalcs $=0$

def add$($self$)$:

self. num$0$fCalcs $+=1$

return $x+y$

def sub$($self$)$:

self. num$0$fCalcs $+=1$

return $x-y$

d$.)$

class Calc:

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

self. num$0$fCalcs $=0$

def add$($self$)$:

num$0$fCalcs $+=1$

return $x+y$

def sub$($self$)$:

num$0$fCalcs $+=1$

return $x-y$