Consider the following statements about root locus 1. The intersection of root locus branches with the imaginary axis can be determined by the use of Routh criterion2. Segments of real axis having an odd number of real axis open loop poles plus zeros to their right are not parts of root locus3. The number of root locus branches terminating on infinity is always zero Which of the above statements are correct?

• A. 1, 2 and 3
• B. 1 and 2 only
• C. 1 only
• D. 2 and 3 only