During which stage do the bivalent chromosomes clearly appear as tetrads?

Match the stages of meiosis in Column-$I$ to their characteristic features in Column-$II$ and select the correct option using the codes given below.

Column-$I$	Column-$II$
$(A)$ Pachytene	$(i)$ Pairing of homologous chromosomes
$(B)$ Metaphase-$I$	$(ii)$ Terminalisation of chiasmata
$(C)$ Diakinesis	$(iii)$ Crossing-over takes place
$(D)$ Zygotene	$(iv)$ Chromosomes align at equatorial plate

The sub-stages of Prophase-$I$ are given in order.

Which stage of meiosis can last for months or years in the oocytes of some vertebrates?

In which of the following stages do chromosomes appear long,thin,and thread-like?

In the pachytene stage: