Which of the following serves as a mitotic spindle poison?

Which one of the following precedes the reformation of the nuclear envelope during the $M-$phase of the cell cycle?

At which region do the spindle fibers attach to the chromosome?

During which phase do kinetochores attach to spindle fibers?

Which of the following phases are the longest and shortest in mitosis?

Select the correct option for a chromosome in prophase,representing the number of centromeres,chromatids,and kinetochores respectively.