'Sportsgal' Is an Unregistered Trade Mark of a Clothing Company

'Sportsgal' is an unregistered trade mark of a clothing company that has been operating for ten years in the town of Catherine in the Northern Territory.Another clothing company that has owned the registered trade mark 'Sportsgirl' since 2007 wants to open a store in Catherine.Which is the most likely legal outcome?

A) 'Sportsgirl' must operate under a different name in Catharine.
B) Both 'Sportsgal' and 'Sportsgirl' may operate in Catherine.
C) Both 'Sportsgal' and 'Sportsgirl' will have to operate under different names in Catharine.
D) 'Sportsgal' must operate under a different name in Catharine.