In Exercise, supply the missing justification in the formal proof of validity for the given argument.
1. (D ⋁ E) → (F ⋁ G)
2. ~ [(D ⋁ E) ⋀ (F ⋁ G)]
∴ ~D ⋀ ~E
3. (D ⋁ E) → [(D ⋁ E) ⋀ (F ⋁ G)]
4. ~(D ⋁ E)
5. ~D ⋀ ~E
a. __________
b. __________
c. __________
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