In a claim for indemnity against Ellis, will Toyco prevail?
Yes, because as between Ellis and Toyco, Ellis was responsible for the design of Zappo. 
Yes, because Toyco and Ellis were joint tortfeasors. 
No, because Toyco, as the manufacturer, was strictly liable to Carla. 
No, if Toyco, by a reasonable inspection, could have discovered the defect in the design of Zappo