If there is no PostScript Language Level option available, the printer driver supports only PostScript level 1. If this is ...

If there is no PostScript Language
Level option available, the printer driver supports only PostScript level
1. If this is the case, contact the manufacturer of your PostScript printer or
imagesetter to find out if it supports at least PostScript level 2. If your
print output device does support PostScript level 2, obtain the updated
PostScript driver from the manufacturer.