Which command should the student use to create an object with one attribute being a valid URL?

A student is learning Python using the interactive interpreter mode. The student issues these commands:

>>> class Url():
... def __init__(self, host, prot):
... self.host = host
... self.prot = prot
... self.url = self.prot + "://" + self.host
...
>>>

Which command should the student use to create an object with one attribute being a valid URL?

• >>> url2 = Url(‘www.cisco.com’, ‘http’)
• >>> url2 = Url(‘http’, ‘www.cisco.com’)
• >>> url2 = Url(URL, ‘http://’, ‘www.cisco.com’)
• >>> url2 = Url(‘http’, ‘://’, ‘www.cisco.com’)