Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to make solar cells [title] Obtain 2 equal-sized glass plates. [step] Plates of the size used as covers for microscope slides would be ideal. [title] Clean both surfaces of the plates with alcohol.

Ending1: [step] The result of the washing of the plates should be a shimmer. This shimmer may chip or scratch the glass. Ending2: [step] Ink will run from these plates when the surfaces meet. [substeps] Some glue or caulk will have dripped on surfaces already. Ending3: [step] Allow the alcohol to coat both surfaces of both plates. [title] Remove the glass plates from their cover and place them on a clean plate. Ending4: [step] Once the plates are cleaned, handle them only by the edges. [title] Test the plate faces for conductivity.

Answer format: ending1/ending2/ending3/ending4