What type of qualification is allowed for a welder under API 1104?

The correct choice indicates that passing multiple tests is a valid method for qualifying a welder under API 1104. This approach recognizes that welders can demonstrate their competence across various positions, processes, and materials. By allowing for multiple qualifications, the standard supports flexibility and adaptability in welding practices, ensuring that welders can be certified for different job requirements.

API 1104 acknowledges that welding is a complex skill that benefits from exposure to different techniques and scenarios. This is essential in pipeline construction and maintenance, where the welding conditions and materials might vary significantly. By passing multiple tests, a welder proves their versatility and readiness to tackle varied welding challenges effectively, enhancing overall pipeline integrity and reliability.

In contrast, the other options restrict qualifications in ways that wouldn't fully reflect a welder's capability or adaptability in real-world applications. Such limitations would reduce the overall effectiveness of the qualification process in addressing the diverse nature of welding tasks found in pipeline work.