What change needs to be made in the following code segment so that lName will have a default value of "unknown"?

class PhoneNumber : def __init__(self, lName, phone = "215-555-1212") : self._name = lName self._phone = phone 

Answer Choices:

A. Replace self._name = lName with self._name = "unknown"

B.	Replace the lName parameter with lName = "unknown"

C.	Add name = "unknown" to the end of the constructor

D.	Add self._lName = "unknown" to the end of the constructor