If programming a class to represent a calculator, which class containing parameterless methods could be used to return the total number of calculations performed, clear the total and initialize it to $0?$

a$.)$

class Calc:

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

self.numOfCalcs $=0$

def clearTotal$($self$)$:

self.numOfCalcs $=0$

def returnTotal$($self$)$:

return numOfCalcs

b$.)$

class Calc:

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

self.numOfCalcs $=0$

def clearTotal$($self$)$:

self.numOfCalcs $=0$

def returnTotal$($self$)$:

return self.numOfCalcs

c$.)$

class Calc:

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

numOfCalcs $=0$

def clearTotal$($self$)$:

numOfCalcs $=0$

def returnTotal$($self$)$:

return numOfCalcs

d$.)$

class Calc:

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

numOfCalcs $=0$

def clearTotal$($self$)$:

self.numOfCalcs $=0$

def returnTotal$($self$)$:

return self.numOfCalcs