Please choose the correct solution to the question: What adhesive metal should you use when soldering glass?

Solution1: Solder won't stick to glass by itself--you need another metal on the surface to hold it in. Adhesive copper foil will wrap around the edge of the glass you want to solder.

Solution2: Solder won't stick to glass by itself--you need another metal on the surface to hold it in. Adhesive rubber foil will wrap around the edge of the glass you want to solder.

Answer format: solution1/solution2