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Two atoms A and B are represented by their mass number and atomic number as 5826 A and 5827 B. Read the following statements:
(a) A and B belong to the same element.
(b) A and B have the same number of nucleons.
(c) A and B have the same number of electrons.
(d) A and B are isotopes.
(e) A and B are isobars.
Which one of the following groups of statements is correct?