Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to polish concrete [title] Evaluate the concrete. [step] Use a mohs hardness pick to determine the degree of mineral hardness. Determining whether the concrete is soft, medium, or hard will allow you to fine-tune the polishing process.

Ending1: If the concrete is quite soft, rough, with a woody, leather-like texture, you will need to take an oil or a lime-based polishing compound and sand its surface. [title] Determine the characteristics of the car's paint job. Ending2: [substeps] Average grade stones must be at least. 14-16 psi, heavy if the stone is glass, coarse if the stone is entones or has luster, and powder if the stones are clay or a combination. Ending3: [substeps] Use the tools supplied in the kit to test the hardness of the concrete against the hardness of other minerals. The softest mineral that is capable of scraping the concrete is harder than the concrete, placing the concrete's level of hardness directly below that mineral. Ending4: Pastel concrete will require a finer grit mohs or higher. For hard rock concrete, use a smoother mohs.

Answer format: ending1/ending2/ending3/ending4