Table:
text: 1986 Tour de France
Stages
Stage results
Stage Date_ Route Terrain Length_ Winner
P 4 July Boulogne-Billancourt Individual time trial km (mi) Thierry Marie ( FRA )
1 5 July Nanterre – Sceaux Plain stage km (mi) Pol Verschuere ( BEL )
2 5 July Meudon – Saint-Quentin-en-Yvelines Team time trial km (mi) Système U
3 6 July Levallois-Perret – Liévin Plain stage km (mi) Davis Phinney ( USA )
4 7 July Liévin – Évreux Plain stage km (mi) Pello Ruiz ( ESP )
5 8 July Évreux – Villers-sur-Mer Plain stage km (mi) Johan van der Velde ( NED )

Question: Which stage led the Tour de France tour through Boulogne-Billancourt in 1986?