就精原母細胞（spermatogonium）到精子（sperm）的過程，下列那一項之順序最佳？
Spermatogonium→primary spermatocyte→first meiosis→secondary spermatocyte→second meiosis→spermatid→sperm
Spermatogonium→first meiosis→primary spermatocyte→second meiosis→secondary spermatocyte→spermatid→sperm
Spermatogonium→primary spermatocyte→first meiosis→secondary spermatocyte→spermatid→second meiosis→sperm
Spermatogonium→primary spermatocyte→secondary spermatocyte→first meiosis→spermatid→second meiosis→sperm
