Which strategy (build-borrow-buy) you think will be superior in this

Technology can be very disruptive to established industries (think of radio, taxis, cameras). So, companies’ strategies must change and evolve to prosper or just to survive. The automotive industry is a great example of an industry that undergoing huge changes. The shift to semi-autonomous cars is happening much faster than was predicted just a few years ago. It has become imperative for big auto companies to be ready for the shift by building (in house development), borrowing (collaboration or joint venture) or buying (acquisition) these new capabilities.
Watch this video: http://fortune.com/2017/02/08/gm-self-driving-cars-video/Read this summarizing article: http://www.businessinsider.com/the-companies-most-likely-to-get-driverless-cars-on-the-road-first-2017-4
which strategy (Build-Borrow-Buy) you think will be superior in this race to autonomous vehicles? Which company or companies do you think will end up on top of the industry? Will it be an existing car company or a disrupter from Silicon Valley?