On what bands may automatically controlled stations transmitting RTTY or data emissions communicate with other automatically controlled digital stations?

Question

Accepted Answer

D. Anywhere in the 6-meter or shorter wavelength bands, and in limited segments of some of the HF bands Automatically controlled digital stations may talk to each other anywhere on 6 meters and shorter wavelengths, and only in limited segments of some HF bands. Most of HF is off limits for automatic-to-automatic contacts.