Which statement is most appropriate?

a. The only useful reference is a questionnaire that is sent direct to a colleague of the applicant’s current or last employer.

b. The only useful reference is a questionnaire that is sent direct to a named person nominated by the applicant.

c. The only useful reference is a questionnaire that is sent direct to the personnel department of the applicant’s current or last employer.

d. The only useful reference is a questionnaire that is given to the applicant to pass onto to his/her current or last employer.