In the expression "one or more of A, B, C, [and, or, and/or] D," what is the correct conjunction? Examples of all three choices abound with apparently equivalent intended meaning.
They do actually have different meanings, but it's very subtle..
"One or more of A, B, C and D" means that of the sets a, b, c and d, you have one of (or more) the options available, with the set A, B, C and D inclusive. Possible sets include any combination of A, B, C, D, but not multiples of any of the set (So, for example, you could pick B, C, D as your set, but not B, B, C).
"One or more of A, B, C or D" means you have the option to pick "one or more of" the defined choices, but not more than one of the set. So you could pick as many of A, B, C, or D that you desire, but you may not mix (A set of A, A, A is acceptable, but a set of A, A, B is not).
The reason for this is that "or" is an exclusive operator. It allows for any choice to be made, but only ONE choice. "And", on the other hand, is inclusive, and allows any choice to be made within the set. So "one or more" of the set "A, B, C and D" allows for any choice to be made on which letter is included, but does NOT allow for multiples of the set.
The last case, "One or more of the set 'A, B, C and/or D'" actually has a hidden operative. The "/" symbol conjoins the two operators, so it allows for BOTH operators to apply. In other words, it removes the limtation of either operator and allows for multiples of each choice AND more than one choice.
I think Zibbobz is correct in his analysis, but I fear most readers would not immediately (or perhaps ever) recognize the subtle distinctions. How can we make clear which of the three choices we mean?
(1.) Multiples permitted across categories, but not within categories (A or AB or CDE, but not AA, or ACC)
One each from one or more categories of A, B, C and D
(2.) Multiples permitted within one category but not across categories (A or AA or BBB, but not AB or ABB)
One or more from one category of A, B, C or D
(3.) Multiples permitted from one or more than one category (A or AA or AAB or AABB)
One or more from each of one or more categories A, B, C and D
Obviously none of these are as succinct as the versions offered, but these are less prone to misinterpretation.