In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it. Your job is to determine which sentence(s) from the passage can be used to search for further information needed to answer the question.
Q: Question: When was the engine invented? Passage:Apart from its engine configuration, the C.43 was conventional and shared its airframe with the three engined C.39. The first five engine aircraft built in France, it was a three bay biplane with fabric covered, rectangular plan wings mounted without stagger. The lower wing had dihedral outboard of the engines, reducing the large interwing gap from inboard to outboard. Though their spans were about equal (on the C.39, the upper span was and the lower one ) or 93% of the upper) the area of the lower wing was only 76% that of the upper because of a narrower chord. The wings were joined by vertical pairs of interplane struts, the forward members attached near the leading edges, and the centre section was supported by similar, shorter cabane struts from the upper fuselage. The inner bay was defined by two close pairs of interplane struts, which between them supported the push-pull pairs of Le Rhone 9C nine cylinder rotary engines about halfway between the wings. Each pair was mounted in a long, cylindrical cowling. Its ailerons, on the upper wing only, were aerodynamically balanced by overhanging extensions beyond the tips, as on the C.39.

A:
The inner bay was defined by two close pairs of interplane struts, which between them supported the push-pull pairs of Le Rhone 9C nine cylinder rotary engines about halfway between the wings