If You Calculate a Relative Risk of 1

If you calculate a relative risk of 1.0 RR=1.0) in a cohort study, what is the correct interpretation?

A) Exposed individuals and unexposed individuals are equally likely to experience the outcome.
B) Exposed individuals are twice as likely 100% more likely) to experience the outcome compared to unexposed individuals.
C) Exposed individuals are half as likely 50% less likely) to experience the outcome compared to unexposed individuals.
D) It is not possible to assess the excess risk among the exposed because there are no unexposed people with the outcome.