What is the ratio of mitotic divisions that take place in the microspore of cycas before and after liberation from the microsporangium during the development of the male gametophyte?

Question

$\begin {array} {1 1} (1)\;1\: : \: 2 & \quad (2)\;2\: :\: 2 \\ (3)\;3\: : \: 2 & \quad (4)\;1\: : \: 1 \end {array}$