Which guideline should a job applicant follow to communicate effectively during an interview?

Answering each question briefly and completely is crucial during an interview as it demonstrates clarity of thought, respect for the interviewer's time, and effective communication skills. A concise response allows the interviewer to grasp your qualification and thought process quickly while ensuring that you address all relevant aspects of the question posed. This balance of brevity and completeness shows you can communicate information clearly and directly, which is a valued trait in most job roles.

In contrast, speaking as much as possible can lead to rambling or over-explaining, potentially diluting your key points. Using complex vocabulary, while it may demonstrate your education or familiarity with certain jargon, risks alienating the interviewer if they are not familiar with those terms. Lastly, avoiding eye contact can come across as a lack of confidence or engagement, negatively impacting the impression you make. Thus, answering questions briefly yet thoroughly is the most effective strategy in an interview setting.