Consider the following statements regarding root loci:

• A. All root loci start from the respective poles of G(s) H(s)
• B. All root loci end at the respective zeros of G(s) H(s) or go to infinity
• C. The root loci are symmetrical about the imaginary axis of the s-plane
• D. All root loci start and end from the respective poles of G(s) H(s) or go to infinity