The enzyme recombinase is required at which stage of meiosis?

Which of the following statements is consistent with meiosis?

In oocytes,which stage can last for months or years,since at this stage the chromosomes decondense and are engaged in $RNA$ synthesis?

Given below are two statements:
Statement $I$: Chromosomes become gradually visible under light microscope during leptotene stage.
Statement $II$: The beginning of diplotene stage is recognized by dissolution of synaptonemal complex.
In the light of the above statements,choose the correct answer from the options given below:

What is the number of chromatids in each chromosome during synapsis?

In meiosis,the centromere divides during