Consider a relation R(A, B) that contains r tuples, and a relation S(B, C) that contains s tuples; assume r > 0 and s > 0. Make no assumptions about keys. For the following relational algebra expression, in terms of r and s the minimum and maximum number of tuples that could be in the result?
given answer is: minimum:0, maximum: min(r,s)
according to me: minimum:0, maximum: r
please give answer with proper explanation.