Which of the following $CdKs$ and cyclins comes under the $G_{1}$ checkpoint?

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

Which phase of the cell cycle is also known as the resting phase?

Which phase is the initial phase of interphase?

Which is the final phase of interphase?

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: