Refer to the data below and answer the questions that follow.
A + B means A is the brother of B
A – B means A is the mother of B
A = B means A is the father of B
A @ B means A is the son of B
If A @ B ? G = K, then which of the following must come in the place of the question mark for A to be the uncle of K?
cannot be determined
+
@
-
=
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