A structured interview consists of

The correct option is: A series of pre-determined questions.

Step-by-step Explanation:

1. Definition of a Structured Interview:
A structured interview (also known as a standardized interview) is a quantitative research or assessment method where the interviewer asks a standard set of questions to every participant. The questions are prepared in advance (pre-determined) and asked in a specific, fixed order.

2. Key Characteristics:
- Standardization: Every interviewee is asked the exact same questions in the exact same sequence. This ensures high consistency and reliability.
- Pre-determination: The questions are fully drafted before the interview starts, leaving no room for spontaneous or open-ended deviations by the interviewer.
- Comparability: Because the format is identical for all participants, it is easy to compare responses directly and perform quantitative analysis.

3. Why the other options are incorrect:
- A series of pre-determined questions along with questions asked at the time of the interview: This describes a semi-structured interview, which combines pre-planned questions with spontaneous follow-ups based on the candidate's answers.
- A series of questions on the structure of the research: This is incorrect because the term "structured" refers to the standardized format and methodology of conducting the interview, not the subject matter of the questions.
- Questions asked at random: This is characteristic of an unstructured or informal interview, where there is no set list of questions or pre-planned format.