The video clip below shows a wet mount containing Cryptosporidium parvum oocysts.  What is the correct statement regarding the event shown?

(The video will begin when you move your mouse over the image)

(a) The clip demonstrates the encystation a C. parvum oocyst
(b) The clip demonstrates the excystation of a C. parvum sporozoite being released from a sporocyst
(c) The clip demonstrates the excystation of a C. parvum sporozoite being released from an oocyst
(d) The clip demonstrates the sporulation of a C. parvum oocyst