9. For some set A to be considered countably infinite, we know that... (Select all the choices that apply) (a) The set A must only have one type of object. (b) The size of set A must be equal to the size of set N, or in other words, | A |=| N |. (c) The size of set A must be equal to No, or in other words, | A |= No. (d) The size of set A must be equal to the size of set R, or in other words, | A |=| R |.

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