Which type of cell division forms spermatids from the secondary spermatocytes ?

Which of the following undergoes, the meiosis-I division?

Ovulation in mammals refers to

$A$ -Spermatids formed from secondary spermatocytes.

$R$ -The spermatids are transformed into spermatozoa by the process called spermiogenesis.

When male ejaculates sperms during coitus of which for normal fertility at least……. percent sperms must have normal shape and size and at least ………..per cent of them must show vigorous motility