Please fill in the blanks for the definitions specified below. (a) are and some of the (non) commercial Database Management Systems. - 3 points. (b) Relational Data Model is based on the theory in Math. -2 points. (c) Consider two relations called Rs and R2. The number of tuples in Rs and R2 are t, and tz respectively. The number of attributes of R1 and R2, on the other hand, are ni and n2. (tu, t2, ni, n2 >= 1). Fill in the blanks with formulae containing t, t2, ni, nz, functions, and constants. Each correct answer - 2 points. If we apply RESTRICT operator to the relation R1, the result will contain a minimum of and a maximum of tuples. The result relation will have a minimum of and a maximum of attributes. If we apply PROJECT operator to the relation Rz, the result will contain a minimum of and a maximum of tuples. The result relation will have a minimum of and a maximum of attributes. Assuming that R1 and R2 are union-compatible, If we UNION R1 and R2 relations, the result will contain a minimum of and a maximum of tuples. The result relation will have a minimum of and a maximum of attributes. if we AJOIN Rand R2 over an attribute (or a set of attributes), the result will contain a minimum of and a maximum of tuples. The result relation will have a minimum of and a maximum of attributes