In $2016,$ Dr$.$ Wang planned to attend a conference in Spain and booked a rental car with a stand alone GPS at the Madrid airport. Once Dr$.$ Wang arrived at the Madrid airport, he found that he could use Google map with his smartphone without paying any extra charges. So Dr$.$ Wang decided to cancel the stand alone GPS in his rental car and consequently saved a good sum of money.

What can we learn from Dr$.$ Wang's experience?

Group of answer choices

Dr$.$ Wang benefited from a substitute of the stand alone GPS industry.

Dr$.$ Wang benefited because the entry barrier of smallphone industry was low.

Dr$.$ Wang benefited because he had strong bargaining power against his wireless service carrier.

Dr$.$ Wang benefited because the rivalry among rental car industry was mild.