For viewing diakinesis,which one of the following would be a suitable material?

In the given figure,which phase is represented by the part labeled $M$?

The formation of complex structures like synaptonemal complexes during the pairing of homologous chromosomes is observed by which of the following?

Match List-$I$ and List-$II$ and select the correct answer using the code given below in the lists:

List-$I$ (Phase of meiosis)	List-$II$ (Event that occurs)
$1$. Prophase $I$	Crossing over occurs
$2$. Metaphase $I$	Sister chromatids migrate to opposite poles
$3$. Anaphase $I$	Homologous chromosomes line up at the equator in pairs

$A$: In the diplotene sub-stage,the two chromosomes of a homologous pair move away from each other.
$R$: The connection is maintained at the site where crossing over has occurred in homologous chromosomes.

What is the exchange of chromosomal segments between maternal and paternal chromosomes during meiosis called?