What would the plan have been if they actually sent Ares 4 to rescue him?

By that I mean, would they have landed at the Ares 3 site to meet with him immediately, then go to Ares 4?

Or would they have landed at the Ares 4 site and sent someone out in a rover to get him at Ares 3?

Either way, they still would have to make the 3200 km journey in a rover, which I think NASA would want to avoid