Ruth, in preparing the celebrations for her upcoming milestone birthday, visited Grand Wines in the high street. In discussing purchases with the sales assistant, she took a chance and let it be known that she was present in her capacity as agent of Professor McGonagall, a local celebrity who was famed throughout the village for her summer fete in the grounds of Hogsmeade Hall. She ordered several cases of Champagne. Grand Wines supplied Ruth with the Champagne as ordered, invoicing Professor McGonagall. Which of the following represents the likely legal position here?

*Provide a detailed explanation of how you have arrived at your designated correct answer including why you have dismissed the other options

1. Ruth is an agent of Professor McGonagall and Grand Wines may presume that Ruth by her conduct has the apparent authority to make contracts on her behalf and bill Professor McGonagall accordingly.
2. Ruth is an agent of Professor McGonagall with implied authority to contract on her behalf coming from the principal's silence on the matter and Grand Wines may bill Professor McGonagall accordingly.
3. Ruth is not an agent of Professor McGonagall having had no authority to act on her behalf and Grand Wines may bill Ruth accordingly.
4. Ruth is not an agent of Professor McGonagall who by her conduct has negated Ruth's authority to act on her behalf and Grand Wines may bill Ruth accordingly.