What does "structured interview" mean in a hiring context for a sales position?

a$.$

an interview in which the applicant is asked questions based on a standardized script

b$.$

an interview in which the applicant is required to ask questions of the interviewer

c$.$

an interview in which an applicant is asked to role$-$play a sales situation

d$.$

an interview in which the interviewer and applicant take turns speaking to each other

e$.$

an interview in which all the applicants are brought in to the same room and asked questions together