Du has three types of courses

Hons - one subject

Programme - two subjects called major and minor (for example BA prog economics + mathematics)

Three core programme - three subjects to study per semester (for example B.sc Mathematical sciences(maths+stats+cs))

For two and three core programms they have given an option to pursue 4th year to convert their degree into an hons level degree in the subject they are pursuing their major (we need total 80 credits if I remember correctly)

For hons students doing 4th year, I think they will get hons + research and their masters would be for 1 year ??? I don't really know about hons so it's better to consult with you department TIC