8th AD MCS Rice(part-time??)

We are pleased to offer you admission to the Master of Computer Science program in the Rice University Department of Computer Science as a part-time student, beginning in the fall semester of 2019. This offer is being made after a careful review of your application, as well as those of many other applicants, and reflects our confidence in your abilities.

学费好便宜啊
为什么是part-time 这没有cpt opt是嘛？