新南professional accounting 后面括号里的（EXT）是啥意思

今天收到了offer，发现program里面的professional accounting（ext），不知道这个括号的意思，麻烦大家谁知道的告知一下
Program Details
Program Code:8415
Program:Professional Accounting (Ext)
Academic Plan:Professional Accounting (Extn)
Program Type:Masters Degree (Coursework)
Attendance Pattern: Full-TimeCampus: Sydney
Location: Kensington
Start Date: Semester 2 2017 (commences 24 July 2017)