What is required from a CxT candidate regarding their application?

A letter of recommendation from a Certified Commissioning Authority (CxA) is critical for a CxT candidate's application because it provides validation of the candidate's qualifications, experience, and skills specific to the field of commissioning. The recommendation serves as a testament to the candidate’s professional competencies, ensuring that they have the necessary background and knowledge pertinent to commissioning processes. This endorsement carries weight in demonstrating the candidate’s alignment with industry standards and practices, which is vital for a role that requires technical expertise and adherence to commissioning principles.

The other options, while potentially beneficial or valuable in different contexts, do not hold the same formal significance in the application process as a letter of recommendation from a CxA. A resume alone may not provide sufficient context or evidence of qualification, and a transcript or seminar participation, although informative, is not a requirement to substantiate the candidate's capabilities as thoroughly as a direct recommendation from an experienced professional in the field.