Unique word - Question
Reading some instructions, I faced the following statement: "You must use a unique email for all recommenders". How should I interpret this sentence?
Option (A): each recommenders must use its own e-mail address.
Option (B): all recommenders must use the same e-mail address.
I searched for the meaning of the word unique (according to Cambridge dictionary it means "being the only existing one of its type or, more generally, unusual, or special in some way"), however, because of the second part (for all recommenders), I was in doubt about how to interpret this sentence.
Thanks in advance :)