Control Systems
For a transfer function H (s) = P(s) / Q(s), where P (s) and Q (s) are polynomials in s. Then

 maximum degree of P (s) and Q (s) differ at most by one.
  degree of P (s) is independent of degree of Q (s).
 the degree of P (s) is always greater than the degree of Q (s).
 the degree of P (s) and Q (s) are same.

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Control Systems
A cascade of three linear time invariant systems is causal and unstable. From this we conclude that

 the majority are unstable and the majority are causal.
 at least one system is unstable and at least one system is causal.
 each system in the cascade is individually caused and unstable.
 at least one system is causal and all systems are unstable.

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