ISO Image - Mode ????

When trying to burn the qnxrtp.iso onto a cd , I’ am asked what mode the iso image was made.
I looked on the QNX site but couldn’t find any info about the burning of the CD

I am given the following options :
Type of Image : Data Mode 1, Data Mode 2, HFS
Raw Data (Yes/No)
Block Size : 2048, 2352
Image Header :
Image Trailer :
Scrambled (Yes/No)
Swapped (Yes/No)

I would appreciate any help you can give