For each of the following arguments, use the STTT to determine whether the argument is valid or invalid. For some of these arguments, Steps 2 C , 3 C , and 4 (i.e., the C-Sequence) will be most efficient; for some of these arguments Steps 2 P , 3 P , and 4 (i.e., the P-Sequence) will be most efficient.

(P₁): A ꓦ B
(P₂): (A ꓦ B) ⊃ C
(P₃): (A ꓦ B) ⊃ D
∴ C ⋅ D