| Which of the following statements is true concerning boiler inspections? |
| A) If the thickness found as a result of gauging is less than original thickness, the boiler must be condemned. |
| B) The marine inspector may require any boiler to be drilled to determine its actual thickness any time its safety is in doubt. |
| C) At the first inspection for certification after a water-tube boiler has been installed for ten years, it shall be gauged by drilling to determine the actual extent of deterioration. |
| D) Any user of a nondestructive testing device must demonstrate that results with an accuracy of plus or minus one percent are consistently obtainable. |
