Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to drill an oil well [title] Identify the drilling site. [step] New oil fields are most easily found where oil is already being drilled. There are a number of ways to test for oil.

Ending1: First, make sure the hole is big enough to fit the oil leak. Keep in mind that drilling a well that is deep in a small area of the ground works well enough, although you should scout the area yourself to be sure. Ending2: [substeps] Pay attention to the number of supports (loads) that you determine the oil source of. Standard oil may have about 10 active supports on its surface. Ending3: [substeps] Soil gas surveys can assist in the discovery of oil. These surveys measure a soil sample for trace amounts of light hydrocarbons (the tell-tale chemical signals of oil). Ending4: That means first, find the site you want to drill in. The location should be clear and easy to access.

Answer format: ending1/ending2/ending3/ending4