English to French Tech/Engineering Automotive / Cars & Trucks segments of cars and SUVs

je ne comprends pas le sens de "permissible" ici, j'ai trouvé "autorisé" mais ça ne cadre pas avec le contexte...

3. Which type of backrest split configuration dispose your “permissible car” ?
(randomize)
 Single part backrest (like a bench)  (1)
 1/3 behind driver’s seat and
 2/3 behind front passenger seat  (2)
 2/3 behind driver’s seat and
 1/3 behind front passenger seat  (3)
 40% behind driver’s seat, 40% behind front passenger seat and 20% in the middle  (4)
 Identical size on each seat  (5)
 Other  (6)