On what bands may automatically controlled stations transmitting RTTY or data emissions communicate with other automatically controlled digital stations?
On any band segment where digital operation is permitted
Anywhere in the non-phone segments of the 10-meter or shorter wavelength bands
Only in the non-phone Extra Class segments of the bands
Anywhere in the 6-meter or shorter wavelength bands, and in limited segments of some of the HF bands✓الإجابة الصحيحة
الشرح
Fully automatic digital contacts are unrestricted only from 6 meters upward. On HF the rules list a handful of narrow segments where they are allowed, so neither of the sweeping choices is right.