The pairing of homologous chromosomes,known as synapsis,occurs in which stage of meiosis?

Chiasmata are firstly seen in

Pachytene occurs during

Identify the stages of meiosis shown below.

$A$ : Chiasmata counting stage is diplotene.
$R$ : Dissolution of the synaptonemal complex occurs except at the sites of crossovers.

Describe the following:
$(a)$ Synapsis
$(b)$ Bivalent
$(c)$ Chiasmata
Draw a diagram to illustrate your answer.