3. Compute the answer set(s) of the following program: p(a)or-p(b). 9(X) -(X). -4(X) + not q(X). r(X) not p(x). 3. Compute the answer set(s) of the following program: p(a)or-p(b). 9(X) -(X). -4(X) + not q(X). r(X) not p(x)