If the open-loop transfer function is a ratio of a numerator polynomial of a degree ' (m)

Question:

If the open-loop transfer function is a ratio of a numerator polynomial of a degree ' $m$ ' and a denominator polynomial of a degree ' $n$ ', then the integer $(n-m)$ represents the number of:
(a) break away points
(b) unstable poles
(c) separate root loci
(d) asymptotes.

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