(3) The Dec VAX computer did not have instructions for Boolean operations and, or, instead, it had instructions bis and bic, both of which take data word r and a mask word m and generated a result z, which consisted of the bits of r modified by the bits of m. For bis, the modification sets the bits of z to 1 at cach position is 1. For bic the modification scts the bits of z to 0 where ever m is 1. (a) Find the Boolean function (in disjunctive normal form), implemented by (i) bis (i) bic. (b) Implement the bitwise operator xor only using bis and bic (write it as a C function)