Let R be a relation over a set A = {a,b,c,d}. What kind of order is R?  Note: Select the order that it satisfies the most properties for. That is, if the relation is a partial order, then it's also technically a preorder; but partial order will be correct, and preorder will be an incorrect response. If the relation doesn't satisfy all of the properties for any of the listed orders, then select "None of these".    R = {(a,a), (b,b), (c,c), (d,d), (a,b), (c,d), (a,c), (b,c), (a,d), (b,d)}

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