The number of chromosomes in $G_1$ phase is $36$. What is the number of chromosomes in $S$ phase?

Which is synthesized in $G_{1}$-phase?

$A :$ $G_2$-phase is the pre-mitotic phase.
$R :$ Chromosomes undergo condensation in this phase.

The sequence of the four phases of the cell cycle is:

At the end of which phase in interphase are all chromosomes replicated?

Select the correct statements regarding $S$-phase of interphase:
$I.$ Occurs between $G_{1}$ and $G_{2}$ phases.
$II.$ $DNA$ replication begins in the nucleus.
$III.$ Centrioles duplicate in the cytoplasm.
$IV.$ As $DNA$ is doubled,the number of chromosomes also doubles.
The option with correct statements is: