In which phase of mitosis does the chromatin network become visible as chromosomes?

Maturation promoting factor $(MPF)$ formation triggers the cell to cross which phase transition?

Which phase of mitosis begins with the condensation of chromosomes along their longitudinal axis?

$A$: The complete disintegration of the nuclear envelope marks the start of metaphase.
$R$: Chromosomes are distinct with two chromatids at this stage.

Nucleolus and nuclear membrane disappear during

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