For the class Employee example provided in tutorial 3.1.5, what code segment could be added to keep track of the number of job titles ever held by an employee? def __init__(fname, lname, empid, title, sal): num_job_titles = 1 def set_jobtitle(title): if len(title) > 0: jobtitle = title num_job_titles += 1 def get_num_jobtitles(): return num_job_titles def __init__(fname, lname, empid, title, sal): self.num_job_titles = 1 def set_jobtitle(title): if len(title) > 0: self.jobtitle = title self.num_job_titles += 1 def get_num_jobtitles(): return self.num_job_titles def __init__(self, fname, lname, empid, title, sal): self.num_job_titles = 1 def set_jobtitle(self,title): if len(title) > 0: self.jobtitle = title self.num_job_titles += 1 def get_num_jobtitles(self): return self.num_job_titles def __init__(self, fname, lname, empid, title, sal): num_job_titles = 1 def set_jobtitle(self,title): if len(title) > 0: jobtitle = title num_job_titles += 1 def get_num_jobtitles(self): return num_job_titles