Study the following statements regarding cockroach.a) A pair of vas deferens open into ejaculatory duct through seminal vesicle.b) The sperms are stored in the seminal vesicles and are glued together in the form of bundles called spermatophores.c) Layers of spermatophore capsule are formed by the secretions of utriculi majores, ejaculatory duct and phallic gland.d) A pair of spermathecae in female open into vagina.Which of the above are correct ?