If A + B means A is the father of B; A x B means A is the brother of B;
A - B means A is the mother of B and
A / B means A is the sister of B,
which of the following relations shows that A is the grandfather of B?
[A]. A/B X C-D/E
[B]. A/E X C/B
[C]. A-B-C+D+E
[D]. A -C XB
Explain the logic too
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