By using Truth-tables for testing the validity of arguments, find out which of the following argument forms are valid?
1.p ∴ p⊃q
2.p·q ∴ p
3.(p⊃q)·(q⊃r), p ∴ q∨r
4.p∨q, p ∴ ∼q
A1, 2, 3
B2, 3
C1, 4
D1
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