It depends on the intended meaning of the sentence.
If you want to say that all three things are included, than you say, "including A, B, and C". If you want to say that only one of the three is included, than you say, "including A, B, or C".
English is a little ambiguous when there are several choices and one or more might be applicable. For example, if a resort advertised that when you visit you can "play golf or tennis", they probably mean that you can do either or both. But if they said, "For a $10 fee, you can play golf or tennis", they probably mean one or the other, and if you want to do both, you have to pay $20.
So sometimes people say "A, B, and/or C" to mean any or all. To clearly say only one you usually need extra words, like "you can choose any one of".