Question: Let R(A, B, C) and S(A, D) two relations schemes. Let R.A be the primary key on schema R and S.A be the primary key

Let R(A, B, C) and S(A, D) two relations schemes. Let

Let R(A, B, C) and S(A, D) two relations schemes. Let R.A be the primary key on schema R and S.A be the primary key on schema S. Let relation T(A, Z) be the set difference of Rand S. and S, i.e, T =R-S. What are the keys of T? Select one or more: Operation is illegal It cannot be determined from the premise B OD

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