Vice-Principal: I advocate that at most one of Teacher Wang and Mr. Qiu can be recommended as a candidate for a national teaching master. Principal: I do not agree. Which of the following most accurately expressed the opinion of the principal? ? ['Neither Mr. Wang nor Mr. Qiu can be recommended as a national teaching teacher candidate.', 'At least one of Teacher Wang and Teacher Qiu can be recommended as a national teaching teacher candidate.', 'Both Mr. Wang and Mr. Qiu can be recommended as national teaching teacher candidates.', 'If Mr. Wang can be recommended as a national teaching teacher candidate, then Mr. Qiu can also.']