Consider the following statements about Deductive systems

1.The method of 19 rules in Copi's method of deduction is incomplete minus the rule of Absorption.

2.'Post Criterion' is criterion for consistency.

3.If an axiom is derivable as a theorem from some other axioms outside the given axiomatic system, such an axiom is definitely 'independent'.

4.All logistic systems are types of deductive system.

A1, 2, 3

B2, 3, 4

C1, 2, 3, 4

D1, 2, 4

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