A is the answer to this question. This is one of the methods used in order to list down different subscriber information, which is sometimes needed to make sure that the different subscribers can also be placed in separate groups. It should be remembered that not all subscribers will like different things. There are some that may want other specific items, and they can all be placed in one group.
A mailing list can be very useful when the same content is sent to people who have different addresses. There are two types of lists that may be created. Different people from different lists may get different emails depending on what they expect to get.