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A, S, M and Dare functions of x and y, and they are defined as follows:

$A(x, y) + x + y$

$S(x, y) = x - y$

$M(x, y) = xy$

$D(x, y) = x/y$,

where $y \neq 0$.

What is the value of S(M(D(A(a, b), 2), D(A(a, b),2)), M(D(S(a, b), 2), D(S(a, b),2)))

1. $a^{2} b^{2}$
2. $ab$
3. $a^{2} –b^{2}$
4. $a/b$
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