Suppose that procedure swap2 is declared as follows (using Pascal syntax): procedure swap2(x, y: integer); procedure f(): integer; var z: integer; begin (* f *) z := x; x := y; return z end f; begin (* swap2 *) y := f() end swap2; Describe the effect of the procedure call swap2(i, A[i]) under each of the following parameter-passing methods: a. Call-by-value-result b. Textual substitution